diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/common/mac.conf qtbase-everywhere-src-5.12.3-b/mkspecs/common/mac.conf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/common/mac.conf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/common/mac.conf	2019-07-10 09:35:08.917628566 -0500
@@ -24,7 +24,7 @@
 
 QMAKE_FIX_RPATH         = install_name_tool -id
 
-QMAKE_LFLAGS_RPATH      = -Wl,-rpath,
+QMAKE_LFLAGS_RPATH      =
 QMAKE_LFLAGS_GCSECTIONS = -Wl,-dead_strip
 
 QMAKE_LFLAGS_REL_RPATH  =
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/create_cmake.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/create_cmake.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/create_cmake.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/create_cmake.prf	2019-07-10 09:35:08.917628566 -0500
@@ -21,7 +21,7 @@
 # at cmake time whether package has been found via a symlink, and correct
 # that to an absolute path. This is only done for installations to
 # the /usr or / prefix.
-CMAKE_INSTALL_LIBS_DIR = $$cmakeTargetPath($$[QT_INSTALL_LIBS])
+CMAKE_INSTALL_LIBS_DIR = $$cmakeTargetPath($$NIX_OUTPUT_OUT/lib/)
 contains(CMAKE_INSTALL_LIBS_DIR, ^(/usr)?/lib(64)?.*): CMAKE_USR_MOVE_WORKAROUND = $$CMAKE_INSTALL_LIBS_DIR
 
 CMAKE_OUT_DIR = $$MODULE_BASE_OUTDIR/lib/cmake
@@ -51,45 +51,20 @@
         $$cmake_extra_source_includes.output
 }
 
-CMAKE_INCLUDE_DIR = $$cmakeRelativePath($$[QT_INSTALL_HEADERS], $$[QT_INSTALL_PREFIX])
-contains(CMAKE_INCLUDE_DIR, "^\\.\\./.*") {
-    CMAKE_INCLUDE_DIR = $$[QT_INSTALL_HEADERS]/
-    CMAKE_INCLUDE_DIR_IS_ABSOLUTE = True
-}
+CMAKE_INCLUDE_DIR = $$NIX_OUTPUT_DEV/include/
+CMAKE_INCLUDE_DIR_IS_ABSOLUTE = True
 
-CMAKE_LIB_DIR = $$cmakeRelativePath($$[QT_INSTALL_LIBS], $$[QT_INSTALL_PREFIX])
-contains(CMAKE_LIB_DIR,"^\\.\\./.*") {
-    CMAKE_LIB_DIR = $$[QT_INSTALL_LIBS]/
-    CMAKE_LIB_DIR_IS_ABSOLUTE = True
-} else {
-    CMAKE_RELATIVE_INSTALL_LIBS_DIR = $$cmakeRelativePath($$[QT_INSTALL_PREFIX], $$[QT_INSTALL_LIBS])
-    # We need to go up another two levels because the CMake files are
-    # installed in $${CMAKE_LIB_DIR}/cmake/Qt5$${CMAKE_MODULE_NAME}
-    CMAKE_RELATIVE_INSTALL_DIR = "$${CMAKE_RELATIVE_INSTALL_LIBS_DIR}../../"
-}
+CMAKE_BIN_DIR = $$NIX_OUTPUT_BIN/bin/
+CMAKE_BIN_DIR_IS_ABSOLUTE = True
 
-CMAKE_BIN_DIR = $$cmakeRelativePath($$[QT_HOST_BINS], $$[QT_INSTALL_PREFIX])
-contains(CMAKE_BIN_DIR, "^\\.\\./.*") {
-    CMAKE_BIN_DIR = $$[QT_HOST_BINS]/
-    CMAKE_BIN_DIR_IS_ABSOLUTE = True
-}
+CMAKE_LIB_DIR = $$NIX_OUTPUT_OUT/lib/
+CMAKE_LIB_DIR_IS_ABSOLUTE = True
 
-CMAKE_PLUGIN_DIR = $$cmakeRelativePath($$[QT_INSTALL_PLUGINS], $$[QT_INSTALL_PREFIX])
-contains(CMAKE_PLUGIN_DIR, "^\\.\\./.*") {
-    CMAKE_PLUGIN_DIR = $$[QT_INSTALL_PLUGINS]/
-    CMAKE_PLUGIN_DIR_IS_ABSOLUTE = True
-}
-
-win32:!static:!staticlib {
-    CMAKE_DLL_DIR = $$cmakeRelativePath($$[QT_INSTALL_BINS], $$[QT_INSTALL_PREFIX])
-    contains(CMAKE_DLL_DIR, "^\\.\\./.*") {
-        CMAKE_DLL_DIR = $$[QT_INSTALL_BINS]/
-        CMAKE_DLL_DIR_IS_ABSOLUTE = True
-    }
-} else {
-    CMAKE_DLL_DIR = $$CMAKE_LIB_DIR
-    CMAKE_DLL_DIR_IS_ABSOLUTE = $$CMAKE_LIB_DIR_IS_ABSOLUTE
-}
+CMAKE_PLUGIN_DIR = $$NIX_OUTPUT_PLUGIN/
+CMAKE_PLUGIN_DIR_IS_ABSOLUTE = True
+ 
+CMAKE_DLL_DIR = $$NIX_OUTPUT_OUT/lib/
+CMAKE_DLL_DIR_IS_ABSOLUTE = True
 
 static|staticlib:CMAKE_STATIC_TYPE = true
 
@@ -169,7 +144,7 @@
       cmake_target_file
 
     cmake_qt5_plugin_file.files = $$cmake_target_file.output
-    cmake_qt5_plugin_file.path = $$[QT_INSTALL_LIBS]/cmake/Qt5$${CMAKE_MODULE_NAME}
+    cmake_qt5_plugin_file.path = $$NIX_OUTPUT_OUT/lib/cmake/Qt5$${CMAKE_MODULE_NAME}
     INSTALLS += cmake_qt5_plugin_file
 
     return()
@@ -318,7 +293,7 @@
     cmake_qt5_module_files.files += $$cmake_macros_file.output
 }
 
-cmake_qt5_module_files.path = $$[QT_INSTALL_LIBS]/cmake/Qt5$${CMAKE_MODULE_NAME}
+cmake_qt5_module_files.path = $$NIX_OUTPUT_OUT/lib/cmake/Qt5$${CMAKE_MODULE_NAME}
 
 # We are generating cmake files. Most developers of Qt are not aware of cmake,
 # so we require automatic tests to be available. The only module which should
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in qtbase-everywhere-src-5.12.3-b/mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in	2019-07-10 09:35:08.917628566 -0500
@@ -3,30 +3,6 @@
     message(FATAL_ERROR \"Qt 5 $${CMAKE_MODULE_NAME} module requires at least CMake version 3.1.0\")
 endif()
 
-!!IF !isEmpty(CMAKE_USR_MOVE_WORKAROUND)
-!!IF !isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-set(_qt5$${CMAKE_MODULE_NAME}_install_prefix \"$$[QT_INSTALL_PREFIX]\")
-!!ELSE
-get_filename_component(_IMPORT_PREFIX \"${CMAKE_CURRENT_LIST_FILE}\" PATH)
-# Use original install prefix when loaded through a
-# cross-prefix symbolic link such as /lib -> /usr/lib.
-get_filename_component(_realCurr \"${_IMPORT_PREFIX}\" REALPATH)
-get_filename_component(_realOrig \"$$CMAKE_INSTALL_LIBS_DIR/cmake/Qt5$${CMAKE_MODULE_NAME}\" REALPATH)
-if(_realCurr STREQUAL _realOrig)
-    get_filename_component(_qt5$${CMAKE_MODULE_NAME}_install_prefix \"$$CMAKE_INSTALL_LIBS_DIR/$${CMAKE_RELATIVE_INSTALL_LIBS_DIR}\" ABSOLUTE)
-else()
-    get_filename_component(_qt5$${CMAKE_MODULE_NAME}_install_prefix \"${CMAKE_CURRENT_LIST_DIR}/$${CMAKE_RELATIVE_INSTALL_DIR}\" ABSOLUTE)
-endif()
-unset(_realOrig)
-unset(_realCurr)
-unset(_IMPORT_PREFIX)
-!!ENDIF
-!!ELIF isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-get_filename_component(_qt5$${CMAKE_MODULE_NAME}_install_prefix \"${CMAKE_CURRENT_LIST_DIR}/$${CMAKE_RELATIVE_INSTALL_DIR}\" ABSOLUTE)
-!!ELSE
-set(_qt5$${CMAKE_MODULE_NAME}_install_prefix \"$$[QT_INSTALL_PREFIX]\")
-!!ENDIF
-
 !!IF !equals(TEMPLATE, aux)
 # For backwards compatibility only. Use Qt5$${CMAKE_MODULE_NAME}_VERSION instead.
 set(Qt5$${CMAKE_MODULE_NAME}_VERSION_STRING "$$eval(QT.$${MODULE}.VERSION)")
@@ -52,11 +28,7 @@
 macro(_populate_$${CMAKE_MODULE_NAME}_target_properties Configuration LIB_LOCATION IMPLIB_LOCATION)
     set_property(TARGET Qt5::$${CMAKE_MODULE_NAME} APPEND PROPERTY IMPORTED_CONFIGURATIONS ${Configuration})
 
-!!IF isEmpty(CMAKE_DLL_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_DLL_DIR}${LIB_LOCATION}\")
-!!ELSE
     set(imported_location \"$${CMAKE_DLL_DIR}${LIB_LOCATION}\")
-!!ENDIF
     _qt5_$${CMAKE_MODULE_NAME}_check_file_exists(${imported_location})
     set_target_properties(Qt5::$${CMAKE_MODULE_NAME} PROPERTIES
         \"INTERFACE_LINK_LIBRARIES\" \"${_Qt5$${CMAKE_MODULE_NAME}_LIB_DEPENDENCIES}\"
@@ -69,11 +41,7 @@
     )
 
 !!IF !isEmpty(CMAKE_WINDOWS_BUILD)
-!!IF isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-    set(imported_implib \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_LIB_DIR}${IMPLIB_LOCATION}\")
-!!ELSE
     set(imported_implib \"IMPORTED_IMPLIB_${Configuration}\" \"$${CMAKE_LIB_DIR}${IMPLIB_LOCATION}\")
-!!ENDIF
     _qt5_$${CMAKE_MODULE_NAME}_check_file_exists(${imported_implib})
     if(NOT \"${IMPLIB_LOCATION}\" STREQUAL \"\")
         set_target_properties(Qt5::$${CMAKE_MODULE_NAME} PROPERTIES
@@ -89,24 +57,13 @@
 !!IF !no_module_headers
 !!IF !isEmpty(CMAKE_BUILD_IS_FRAMEWORK)
     set(_Qt5$${CMAKE_MODULE_NAME}_OWN_INCLUDE_DIRS
-      \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_LIB_DIR}Qt$${CMAKE_MODULE_NAME}.framework\"
-      \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_LIB_DIR}Qt$${CMAKE_MODULE_NAME}.framework/Headers\"
+      \"$${CMAKE_LIB_DIR}Qt$${CMAKE_MODULE_NAME}.framework\"
+      \"$${CMAKE_LIB_DIR}Qt$${CMAKE_MODULE_NAME}.framework/Headers\"
     )
 !!IF isEmpty(CMAKE_NO_PRIVATE_INCLUDES)
     set(Qt5$${CMAKE_MODULE_NAME}_PRIVATE_INCLUDE_DIRS
-        \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_LIB_DIR}Qt$${CMAKE_MODULE_NAME}.framework/Versions/$$section(VERSION, ., 0, 0)/Headers/$$VERSION/\"
-        \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_LIB_DIR}Qt$${CMAKE_MODULE_NAME}.framework/Versions/$$section(VERSION, ., 0, 0)/Headers/$$VERSION/$${MODULE_INCNAME}\"
-    )
-!!ELSE
-    set(Qt5$${CMAKE_MODULE_NAME}_PRIVATE_INCLUDE_DIRS \"\")
-!!ENDIF
-!!ELSE
-!!IF isEmpty(CMAKE_INCLUDE_DIR_IS_ABSOLUTE)
-    set(_Qt5$${CMAKE_MODULE_NAME}_OWN_INCLUDE_DIRS \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$$CMAKE_INCLUDE_DIR\" \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_INCLUDE_DIR}$${MODULE_INCNAME}\")
-!!IF isEmpty(CMAKE_NO_PRIVATE_INCLUDES)
-    set(Qt5$${CMAKE_MODULE_NAME}_PRIVATE_INCLUDE_DIRS
-        \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_INCLUDE_DIR}$${MODULE_INCNAME}/$$VERSION\"
-        \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_INCLUDE_DIR}$${MODULE_INCNAME}/$$VERSION/$${MODULE_INCNAME}\"
+        \"$${CMAKE_LIB_DIR}Qt$${CMAKE_MODULE_NAME}.framework/Versions/$$section(VERSION, ., 0, 0)/Headers/$$VERSION/\"
+        \"$${CMAKE_LIB_DIR}Qt$${CMAKE_MODULE_NAME}.framework/Versions/$$section(VERSION, ., 0, 0)/Headers/$$VERSION/$${MODULE_INCNAME}\"
     )
 !!ELSE
     set(Qt5$${CMAKE_MODULE_NAME}_PRIVATE_INCLUDE_DIRS \"\")
@@ -122,7 +79,6 @@
     set(Qt5$${CMAKE_MODULE_NAME}_PRIVATE_INCLUDE_DIRS \"\")
 !!ENDIF
 !!ENDIF
-!!ENDIF
 !!IF !isEmpty(CMAKE_ADD_SOURCE_INCLUDE_DIRS)
     include(\"${CMAKE_CURRENT_LIST_DIR}/ExtraSourceIncludes.cmake\" OPTIONAL)
 !!ENDIF
@@ -272,25 +228,13 @@
 !!IF !isEmpty(CMAKE_FIND_OTHER_LIBRARY_BUILD)
 !!IF isEmpty(CMAKE_DEBUG_TYPE)
 !!IF !isEmpty(CMAKE_STATIC_WINDOWS_BUILD)
-!!IF isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-    if (EXISTS \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_LIB_DIR}$${CMAKE_IMPLIB_FILE_LOCATION_DEBUG}\" )
-!!ELSE // CMAKE_LIB_DIR_IS_ABSOLUTE
     if (EXISTS \"$${CMAKE_IMPLIB_FILE_LOCATION_DEBUG}\" )
-!!ENDIF // CMAKE_LIB_DIR_IS_ABSOLUTE
         _populate_$${CMAKE_MODULE_NAME}_target_properties(DEBUG \"$${CMAKE_IMPLIB_FILE_LOCATION_DEBUG}\" \"\" )
 !!ELSE // CMAKE_STATIC_WINDOWS_BUILD
     if (EXISTS
-!!IF isEmpty(CMAKE_DLL_DIR_IS_ABSOLUTE)
-        \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_DLL_DIR}$${CMAKE_LIB_FILE_LOCATION_DEBUG}\"
-!!ELSE
         \"$${CMAKE_LIB_FILE_LOCATION_DEBUG}\"
-!!ENDIF
       AND EXISTS
-!!IF isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-        \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_LIB_DIR}$${CMAKE_IMPLIB_FILE_LOCATION_DEBUG}\" )
-!!ELSE
         \"$${CMAKE_IMPLIB_FILE_LOCATION_DEBUG}\" )
-!!ENDIF
         _populate_$${CMAKE_MODULE_NAME}_target_properties(DEBUG \"$${CMAKE_LIB_FILE_LOCATION_DEBUG}\" \"$${CMAKE_IMPLIB_FILE_LOCATION_DEBUG}\" )
 !!ENDIF // CMAKE_STATIC_WINDOWS_BUILD
     endif()
@@ -309,25 +253,13 @@
 !!IF !isEmpty(CMAKE_FIND_OTHER_LIBRARY_BUILD)
 !!IF isEmpty(CMAKE_RELEASE_TYPE)
 !!IF !isEmpty(CMAKE_STATIC_WINDOWS_BUILD)
-!!IF isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-    if (EXISTS \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_LIB_DIR}$${CMAKE_IMPLIB_FILE_LOCATION_RELEASE}\" )
-!!ELSE // CMAKE_LIB_DIR_IS_ABSOLUTE
     if (EXISTS \"$${CMAKE_IMPLIB_FILE_LOCATION_RELEASE}\" )
-!!ENDIF // CMAKE_LIB_DIR_IS_ABSOLUTE
         _populate_$${CMAKE_MODULE_NAME}_target_properties(RELEASE \"$${CMAKE_IMPLIB_FILE_LOCATION_RELEASE}\" \"\" )
 !!ELSE // CMAKE_STATIC_WINDOWS_BUILD
     if (EXISTS
-!!IF isEmpty(CMAKE_DLL_DIR_IS_ABSOLUTE)
-        \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_DLL_DIR}$${CMAKE_LIB_FILE_LOCATION_RELEASE}\"
-!!ELSE
         \"$${CMAKE_LIB_FILE_LOCATION_RELEASE}\"
-!!ENDIF
       AND EXISTS
-!!IF isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-        \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_LIB_DIR}$${CMAKE_IMPLIB_FILE_LOCATION_RELEASE}\" )
-!!ELSE
         \"$${CMAKE_IMPLIB_FILE_LOCATION_RELEASE}\" )
-!!ENDIF
         _populate_$${CMAKE_MODULE_NAME}_target_properties(RELEASE \"$${CMAKE_LIB_FILE_LOCATION_RELEASE}\" \"$${CMAKE_IMPLIB_FILE_LOCATION_RELEASE}\" )
 !!ENDIF // CMAKE_STATIC_WINDOWS_BUILD
     endif()
@@ -346,11 +278,7 @@
     macro(_populate_$${CMAKE_MODULE_NAME}_plugin_properties Plugin Configuration PLUGIN_LOCATION)
         set_property(TARGET Qt5::${Plugin} APPEND PROPERTY IMPORTED_CONFIGURATIONS ${Configuration})
 
-!!IF isEmpty(CMAKE_PLUGIN_DIR_IS_ABSOLUTE)
-        set(imported_location \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$${CMAKE_PLUGIN_DIR}${PLUGIN_LOCATION}\")
-!!ELSE
         set(imported_location \"$${CMAKE_PLUGIN_DIR}${PLUGIN_LOCATION}\")
-!!ENDIF
         _qt5_$${CMAKE_MODULE_NAME}_check_file_exists(${imported_location})
         set_target_properties(Qt5::${Plugin} PROPERTIES
             \"IMPORTED_LOCATION_${Configuration}\" ${imported_location}
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/mac/default_post.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/mac/default_post.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/mac/default_post.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/mac/default_post.prf	2019-07-10 09:35:08.917628566 -0500
@@ -64,202 +64,6 @@
     }
 }
 
-# Add the same default rpaths as Xcode does for new projects.
-# This is especially important for iOS/tvOS/watchOS where no other option is possible.
-!no_default_rpath {
-    QMAKE_RPATHDIR += @executable_path/../Frameworks
-    equals(TEMPLATE, lib):!plugin:lib_bundle: QMAKE_RPATHDIR += @loader_path/Frameworks
-}
-
-# Don't pass -headerpad_max_install_names when using Bitcode.
-# In that case the linker emits a warning stating that the flag is ignored when
-# used with bitcode, for reasons that cannot be determined (rdar://problem/20748962).
-# Using this flag is also unnecessary in practice on UIKit platforms since they
-# are sandboxed, and only UIKit platforms support bitcode to begin with.
-!bitcode: QMAKE_LFLAGS += $$QMAKE_LFLAGS_HEADERPAD
-
-app_extension_api_only {
-    QMAKE_CFLAGS              += $$QMAKE_CFLAGS_APPLICATION_EXTENSION
-    QMAKE_CXXFLAGS            += $$QMAKE_CFLAGS_APPLICATION_EXTENSION
-    QMAKE_CXXFLAGS_PRECOMPILE += $$QMAKE_CFLAGS_APPLICATION_EXTENSION
-    QMAKE_LFLAGS              += $$QMAKE_CFLAGS_APPLICATION_EXTENSION
-}
-
-macx-xcode {
-    qmake_pkginfo_typeinfo.name = QMAKE_PKGINFO_TYPEINFO
-    !isEmpty(QMAKE_PKGINFO_TYPEINFO): \
-        qmake_pkginfo_typeinfo.value = $$QMAKE_PKGINFO_TYPEINFO
-    else: \
-        qmake_pkginfo_typeinfo.value = "????"
-    QMAKE_MAC_XCODE_SETTINGS += qmake_pkginfo_typeinfo
-
-    !isEmpty(VERSION) {
-        l = $$split(VERSION, '.') 0 0  # make sure there are at least three
-        VER_MAJ = $$member(l, 0, 0)
-        VER_MIN = $$member(l, 1, 1)
-        VER_PAT = $$member(l, 2, 2)
-        unset(l)
-
-        qmake_full_version.name = QMAKE_FULL_VERSION
-        qmake_full_version.value = $${VER_MAJ}.$${VER_MIN}.$${VER_PAT}
-        QMAKE_MAC_XCODE_SETTINGS += qmake_full_version
-
-        qmake_short_version.name = QMAKE_SHORT_VERSION
-        qmake_short_version.value = $${VER_MAJ}.$${VER_MIN}
-        QMAKE_MAC_XCODE_SETTINGS += qmake_short_version
-    }
-
-    !isEmpty(QMAKE_XCODE_DEBUG_INFORMATION_FORMAT) {
-        debug_information_format.name = DEBUG_INFORMATION_FORMAT
-        debug_information_format.value = $$QMAKE_XCODE_DEBUG_INFORMATION_FORMAT
-        debug_information_format.build = debug
-        QMAKE_MAC_XCODE_SETTINGS += debug_information_format
-    }
-
-    QMAKE_XCODE_ARCHS =
-
-    arch_device.name = "ARCHS[sdk=$${device.sdk}*]"
-    arch_device.value = $$QMAKE_APPLE_DEVICE_ARCHS
-    QMAKE_XCODE_ARCHS += $$QMAKE_APPLE_DEVICE_ARCHS
-    QMAKE_MAC_XCODE_SETTINGS += arch_device
-
-    simulator {
-        arch_simulator.name = "ARCHS[sdk=$${simulator.sdk}*]"
-        arch_simulator.value = $$QMAKE_APPLE_SIMULATOR_ARCHS
-        QMAKE_XCODE_ARCHS += $$QMAKE_APPLE_SIMULATOR_ARCHS
-        QMAKE_MAC_XCODE_SETTINGS += arch_simulator
-    }
-
-    only_active_arch.name = ONLY_ACTIVE_ARCH
-    only_active_arch.value = YES
-    only_active_arch.build = debug
-    QMAKE_MAC_XCODE_SETTINGS += only_active_arch
-} else {
-    device|!simulator: VALID_DEVICE_ARCHS = $$QMAKE_APPLE_DEVICE_ARCHS
-    simulator: VALID_SIMULATOR_ARCHS = $$QMAKE_APPLE_SIMULATOR_ARCHS
-    VALID_ARCHS = $$VALID_DEVICE_ARCHS $$VALID_SIMULATOR_ARCHS
-
-    isEmpty(VALID_ARCHS): \
-        error("QMAKE_APPLE_DEVICE_ARCHS or QMAKE_APPLE_SIMULATOR_ARCHS must contain at least one architecture")
-
-    single_arch: VALID_ARCHS = $$first(VALID_ARCHS)
-
-    ACTIVE_ARCHS = $(filter $(EXPORT_VALID_ARCHS), $(ARCHS))
-    ARCH_ARGS = $(foreach arch, $(if $(EXPORT_ACTIVE_ARCHS), $(EXPORT_ACTIVE_ARCHS), $(EXPORT_VALID_ARCHS)), -arch $(arch))
-
-    QMAKE_EXTRA_VARIABLES += VALID_ARCHS ACTIVE_ARCHS ARCH_ARGS
-
-    arch_flags = $(EXPORT_ARCH_ARGS)
-
-    QMAKE_CFLAGS += $$arch_flags
-    QMAKE_CXXFLAGS += $$arch_flags
-    QMAKE_LFLAGS += $$arch_flags
-
-    QMAKE_PCH_ARCHS = $$VALID_ARCHS
-
-    macos: deployment_target = $$QMAKE_MACOSX_DEPLOYMENT_TARGET
-    ios: deployment_target = $$QMAKE_IOS_DEPLOYMENT_TARGET
-    tvos: deployment_target = $$QMAKE_TVOS_DEPLOYMENT_TARGET
-    watchos: deployment_target = $$QMAKE_WATCHOS_DEPLOYMENT_TARGET
-
-    # If we're doing a simulator and device build, device and simulator
-    # architectures use different paths and flags for the sysroot and
-    # deployment target switch, so we must multiplex them across multiple
-    # architectures using -Xarch. Otherwise we fall back to the simple path.
-    # This is not strictly necessary, but results in cleaner command lines
-    # and makes it easier for people to override EXPORT_VALID_ARCHS to limit
-    # individual rules to a different set of architecture(s) from the overall
-    # build (such as machtest in QtCore).
-    simulator:device {
-        QMAKE_XARCH_CFLAGS =
-        QMAKE_XARCH_LFLAGS =
-        QMAKE_EXTRA_VARIABLES += QMAKE_XARCH_CFLAGS QMAKE_XARCH_LFLAGS
-
-        for (arch, VALID_ARCHS) {
-            contains(VALID_SIMULATOR_ARCHS, $$arch) {
-                sdk = $$simulator.sdk
-                version_identifier = $$simulator.deployment_identifier
-            } else {
-                sdk = $$device.sdk
-                version_identifier = $$device.deployment_identifier
-            }
-
-            version_min_flags = \
-                -Xarch_$${arch} \
-                -m$${version_identifier}-version-min=$$deployment_target
-            QMAKE_XARCH_CFLAGS_$${arch} = $$version_min_flags \
-                -Xarch_$${arch} \
-                -isysroot$$xcodeSDKInfo(Path, $$sdk)
-            QMAKE_XARCH_LFLAGS_$${arch} = $$version_min_flags \
-                -Xarch_$${arch} \
-                -Wl,-syslibroot,$$xcodeSDKInfo(Path, $$sdk)
-
-            QMAKE_XARCH_CFLAGS += $(EXPORT_QMAKE_XARCH_CFLAGS_$${arch})
-            QMAKE_XARCH_LFLAGS += $(EXPORT_QMAKE_XARCH_LFLAGS_$${arch})
-
-            QMAKE_EXTRA_VARIABLES += \
-                QMAKE_XARCH_CFLAGS_$${arch} \
-                QMAKE_XARCH_LFLAGS_$${arch}
-        }
-
-        QMAKE_CFLAGS += $(EXPORT_QMAKE_XARCH_CFLAGS)
-        QMAKE_CXXFLAGS += $(EXPORT_QMAKE_XARCH_CFLAGS)
-        QMAKE_LFLAGS += $(EXPORT_QMAKE_XARCH_LFLAGS)
-    } else {
-        simulator: \
-            version_identifier = $$simulator.deployment_identifier
-        else: \
-            version_identifier = $$device.deployment_identifier
-        version_min_flag = -m$${version_identifier}-version-min=$$deployment_target
-        QMAKE_CFLAGS += -isysroot $$QMAKE_MAC_SDK_PATH $$version_min_flag
-        QMAKE_CXXFLAGS += -isysroot $$QMAKE_MAC_SDK_PATH $$version_min_flag
-        QMAKE_LFLAGS += -Wl,-syslibroot,$$QMAKE_MAC_SDK_PATH $$version_min_flag
-    }
-
-    # Enable precompiled headers for multiple architectures
-    QMAKE_CFLAGS_USE_PRECOMPILE =
-    for (arch, VALID_ARCHS) {
-        icc_pch_style: \
-            use_flag = "-pch-use "
-        else: \
-            use_flag = -include
-
-        # Only use Xarch with multi-arch, as the option confuses ccache
-        count(VALID_ARCHS, 1, greaterThan): \
-            QMAKE_CFLAGS_USE_PRECOMPILE += \
-                -Xarch_$${arch}
-
-        QMAKE_CFLAGS_USE_PRECOMPILE += \
-            $${use_flag}${QMAKE_PCH_OUTPUT_$${arch}}
-    }
-    icc_pch_style {
-        QMAKE_CXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE -include ${QMAKE_PCH_INPUT}
-        QMAKE_CFLAGS_USE_PRECOMPILE =
-    } else {
-        QMAKE_CXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE
-        QMAKE_OBJCFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE
-        QMAKE_OBJCXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE
-    }
-
-    QMAKE_PCH_OUTPUT_EXT = _${QMAKE_PCH_ARCH}$${QMAKE_PCH_OUTPUT_EXT}
-}
-
-cache(QMAKE_XCODE_DEVELOPER_PATH, stash)
-!isEmpty(QMAKE_XCODE_VERSION): \
-    cache(QMAKE_XCODE_VERSION, stash)
-
-QMAKE_XCODE_LIBRARY_SUFFIX = $$qtPlatformTargetSuffix()
-
-xcode_product_bundle_identifier_setting.name = PRODUCT_BUNDLE_IDENTIFIER
-xcode_product_bundle_identifier_setting.value = $$QMAKE_TARGET_BUNDLE_PREFIX
-isEmpty(xcode_product_bundle_identifier_setting.value): \
-    xcode_product_bundle_identifier_setting.value = "com.yourcompany"
-xcode_product_bundle_target = $$QMAKE_BUNDLE
-isEmpty(xcode_product_bundle_target): \
-    xcode_product_bundle_target = ${PRODUCT_NAME:rfc1034identifier}
-xcode_product_bundle_identifier_setting.value = "$${xcode_product_bundle_identifier_setting.value}.$${xcode_product_bundle_target}"
-QMAKE_MAC_XCODE_SETTINGS += xcode_product_bundle_identifier_setting
-
 !macx-xcode {
     generate_xcode_project.commands = @$(QMAKE) -spec macx-xcode $(EXPORT__PRO_FILE_)
     generate_xcode_project.target = xcodeproj
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/mac/default_pre.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/mac/default_pre.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/mac/default_pre.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/mac/default_pre.prf	2019-07-10 09:35:08.917628566 -0500
@@ -1,60 +1,2 @@
 CONFIG = asset_catalogs rez $$CONFIG
 load(default_pre)
-
-isEmpty(QMAKE_XCODE_DEVELOPER_PATH) {
-    # Get path of Xcode's Developer directory
-    QMAKE_XCODE_DEVELOPER_PATH = $$system("/usr/bin/xcode-select --print-path 2>/dev/null")
-    isEmpty(QMAKE_XCODE_DEVELOPER_PATH): \
-        error("Xcode path is not set. Please use xcode-select to choose Xcode installation path.")
-
-    # Make sure Xcode path is valid
-    !exists($$QMAKE_XCODE_DEVELOPER_PATH): \
-        error("Xcode is not installed in $${QMAKE_XCODE_DEVELOPER_PATH}. Please use xcode-select to choose Xcode installation path.")
-}
-
-isEmpty(QMAKE_XCODEBUILD_PATH): \
-    QMAKE_XCODEBUILD_PATH = $$system("/usr/bin/xcrun -find xcodebuild 2>/dev/null")
-
-!isEmpty(QMAKE_XCODEBUILD_PATH) {
-    # Make sure Xcode is set up properly
-    !system("/usr/bin/xcrun xcodebuild -license check 2>/dev/null"): \
-        error("Xcode not set up properly. You need to confirm the license agreement by running 'sudo xcrun xcodebuild -license accept'.")
-
-    isEmpty(QMAKE_XCODE_VERSION) {
-        # Extract Xcode version using xcodebuild
-        xcode_version = $$system("/usr/bin/xcrun xcodebuild -version")
-        QMAKE_XCODE_VERSION = $$member(xcode_version, 1)
-        isEmpty(QMAKE_XCODE_VERSION): error("Could not resolve Xcode version.")
-        unset(xcode_version)
-    }
-}
-
-isEmpty(QMAKE_TARGET_BUNDLE_PREFIX) {
-    QMAKE_XCODE_PREFERENCES_FILE = $$(HOME)/Library/Preferences/com.apple.dt.Xcode.plist
-    exists($$QMAKE_XCODE_PREFERENCES_FILE): \
-        QMAKE_TARGET_BUNDLE_PREFIX = $$system("/usr/libexec/PlistBuddy -c 'print IDETemplateOptions:bundleIdentifierPrefix' $$QMAKE_XCODE_PREFERENCES_FILE 2>/dev/null")
-
-    !isEmpty(_QMAKE_CACHE_):!isEmpty(QMAKE_TARGET_BUNDLE_PREFIX): \
-        cache(QMAKE_TARGET_BUNDLE_PREFIX)
-}
-
-QMAKE_ASSET_CATALOGS_APP_ICON = AppIcon
-
-# Make the default debug info format for static debug builds
-# DWARF instead of DWARF with dSYM. This cuts down build times
-# for application debug builds significantly, as Xcode doesn't
-# have to pull out all the DWARF info from the Qt static libs
-# and put it into a dSYM file. We don't need that dSYM file in
-# the first place, since the information is available in the
-# object files inside the archives (static libraries).
-macx-xcode:qtConfig(static): \
-    QMAKE_XCODE_DEBUG_INFORMATION_FORMAT = dwarf
-
-# This variable is used by the xcode_dynamic_library_suffix
-# feature, which allows Xcode to choose the Qt libraries to link to
-# at build time, depending on the current Xcode SDK and configuration.
-QMAKE_XCODE_LIBRARY_SUFFIX_SETTING = QT_LIBRARY_SUFFIX
-
-xcode_copy_phase_strip_setting.name = COPY_PHASE_STRIP
-xcode_copy_phase_strip_setting.value = NO
-QMAKE_MAC_XCODE_SETTINGS += xcode_copy_phase_strip_setting
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/mac/sdk.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/mac/sdk.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/mac/sdk.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/mac/sdk.prf	2019-07-10 09:35:08.917628566 -0500
@@ -1,54 +1 @@
 
-isEmpty(QMAKE_MAC_SDK): \
-    error("QMAKE_MAC_SDK must be set when using CONFIG += sdk.")
-
-contains(QMAKE_MAC_SDK, .*/.*): \
-    error("QMAKE_MAC_SDK can only contain short-form SDK names (eg. macosx, iphoneos)")
-
-defineReplace(xcodeSDKInfo) {
-    info = $$1
-    equals(info, "Path"): \
-        infoarg = --show-sdk-path
-    equals(info, "PlatformPath"): \
-        infoarg = --show-sdk-platform-path
-    equals(info, "SDKVersion"): \
-        infoarg = --show-sdk-version
-    sdk = $$2
-    isEmpty(sdk): \
-        sdk = $$QMAKE_MAC_SDK
-
-    isEmpty(QMAKE_MAC_SDK.$${sdk}.$${info}) {
-        QMAKE_MAC_SDK.$${sdk}.$${info} = $$system("/usr/bin/xcrun --sdk $$sdk $$infoarg 2>/dev/null")
-        # --show-sdk-platform-path won't work for Command Line Tools; this is fine
-        # only used by the XCTest backend to testlib
-        isEmpty(QMAKE_MAC_SDK.$${sdk}.$${info}):if(!isEmpty(QMAKE_XCODEBUILD_PATH)|!equals(infoarg, "--show-sdk-platform-path")): \
-            error("Could not resolve SDK $$info for \'$$sdk\' using $$infoarg")
-        cache(QMAKE_MAC_SDK.$${sdk}.$${info}, set stash, QMAKE_MAC_SDK.$${sdk}.$${info})
-    }
-
-    return($$eval(QMAKE_MAC_SDK.$${sdk}.$${info}))
-}
-
-QMAKE_MAC_SDK_PATH = $$xcodeSDKInfo(Path)
-QMAKE_MAC_SDK_PLATFORM_PATH = $$xcodeSDKInfo(PlatformPath)
-QMAKE_MAC_SDK_VERSION = $$xcodeSDKInfo(SDKVersion)
-
-QMAKESPEC_NAME = $$basename(QMAKESPEC)
-
-# Resolve SDK version of various tools
-for(tool, $$list(QMAKE_CC QMAKE_CXX QMAKE_FIX_RPATH QMAKE_AR QMAKE_RANLIB QMAKE_LINK QMAKE_LINK_SHLIB QMAKE_ACTOOL QMAKE_LINK_C QMAKE_LINK_C_SHLIB)) {
-    tool_variable = QMAKE_MAC_SDK.$${QMAKESPEC_NAME}.$${QMAKE_MAC_SDK}.$${tool}
-    !isEmpty($$tool_variable) {
-        $$tool = $$eval($$tool_variable)
-        next()
-    }
-
-    value = $$eval($$tool)
-    isEmpty(value): next()
-
-    sysrooted = $$system("/usr/bin/xcrun -sdk $$QMAKE_MAC_SDK -find $$first(value) 2>/dev/null")
-    isEmpty(sysrooted): next()
-
-    $$tool = $$sysrooted $$member(value, 1, -1)
-    cache($$tool_variable, set stash, $$tool)
-}
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qml_module.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qml_module.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qml_module.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qml_module.prf	2019-07-10 09:35:08.917628566 -0500
@@ -54,7 +54,7 @@
 
 qmldir.files = $$qmldir_file
 install_qml_files: qmldir.files += $$fq_qml_files
-qmldir.path = $$[QT_INSTALL_QML]/$$TARGETPATH
+qmldir.path = $$NIX_OUTPUT_QML/$$TARGETPATH
 INSTALLS += qmldir
 
 qmlfiles.base = $$_PRO_FILE_PWD_
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qml_plugin.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qml_plugin.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qml_plugin.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qml_plugin.prf	2019-07-10 09:35:08.918628595 -0500
@@ -50,7 +50,7 @@
 
 DESTDIR = $$MODULE_BASE_OUTDIR/qml/$$TARGETPATH
 
-target.path = $$[QT_INSTALL_QML]/$$TARGETPATH
+target.path = $$NIX_OUTPUT_QML/$$TARGETPATH
 INSTALLS += target
 
 # Some final setup
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_app.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_app.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_app.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_app.prf	2019-07-10 09:35:08.918628595 -0500
@@ -30,7 +30,7 @@
     target.path = $$[QT_HOST_BINS]
 } else {
     !build_pass:qtConfig(debug_and_release): CONFIG += release
-    target.path = $$[QT_INSTALL_BINS]
+    target.path = $$NIX_OUTPUT_BIN/bin
     CONFIG += relative_qt_rpath  # Qt's tools and apps should be relocatable
 }
 INSTALLS += target
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_build_paths.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_build_paths.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_build_paths.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_build_paths.prf	2019-07-10 09:35:08.918628595 -0500
@@ -24,6 +24,6 @@
 !force_independent {
     # If the module is not built independently, everything ends up in qtbase.
     # This is the case in non-prefix builds, except for selected modules.
-    MODULE_BASE_OUTDIR = $$[QT_HOST_PREFIX]
-    MODULE_QMAKE_OUTDIR = $$[QT_HOST_PREFIX]
+    MODULE_BASE_OUTDIR = $$NIX_OUTPUT_OUT
+    MODULE_QMAKE_OUTDIR = $$NIX_OUTPUT_OUT
 }
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_common.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_common.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_common.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_common.prf	2019-07-10 09:35:08.918628595 -0500
@@ -34,8 +34,8 @@
         qqt_libdir = \$\$\$\$[QT_HOST_LIBS]
         qt_libdir = $$[QT_HOST_LIBS]
     } else {
-        qqt_libdir = \$\$\$\$[QT_INSTALL_LIBS]
-        qt_libdir = $$[QT_INSTALL_LIBS]
+        qqt_libdir = \$\$\$\$NIX_OUTPUT_OUT/lib
+        qt_libdir = $$NIX_OUTPUT_OUT/lib
     }
     contains(QMAKE_DEFAULT_LIBDIRS, $$qt_libdir) {
         lib_replace.match = "[^ ']*$$rplbase/lib"
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_docs.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_docs.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_docs.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_docs.prf	2019-07-10 09:35:08.918628595 -0500
@@ -45,7 +45,7 @@
 
 QDOC += -outputdir $$shell_quote($$QMAKE_DOCS_OUTPUTDIR)
 !build_online_docs: \
-    QDOC += -installdir $$shell_quote($$[QT_INSTALL_DOCS])
+    QDOC += -installdir $$shell_quote($$NIX_OUTPUT_DOC)
 PREP_DOC_INDEXES =
 DOC_INDEXES =
 !isEmpty(QTREPOS) {
@@ -64,8 +64,8 @@
         DOC_INDEXES += -indexdir $$shell_quote($$qrep/doc)
 } else {
     prepare_docs: \
-        PREP_DOC_INDEXES += -indexdir $$shell_quote($$[QT_INSTALL_DOCS/get])
-    DOC_INDEXES += -indexdir $$shell_quote($$[QT_INSTALL_DOCS/get])
+        PREP_DOC_INDEXES += -indexdir $$shell_quote($$NIX_OUTPUT_DOC)
+    DOC_INDEXES += -indexdir $$shell_quote($$NIX_OUTPUT_DOC)
 }
 
 qtattributionsscanner.target = qtattributionsscanner
@@ -88,12 +88,12 @@
     qch_docs.commands = $$QHELPGENERATOR $$shell_quote($$QMAKE_DOCS_OUTPUTDIR/$${QMAKE_DOCS_TARGET}.qhp) -o $$shell_quote($$QMAKE_DOCS_BASE_OUTDIR/$${QMAKE_DOCS_TARGET}.qch)
 
     inst_html_docs.files = $$QMAKE_DOCS_OUTPUTDIR
-    inst_html_docs.path = $$[QT_INSTALL_DOCS]
+    inst_html_docs.path = $$NIX_OUTPUT_DOC
     inst_html_docs.CONFIG += no_check_exist directory no_default_install no_build
     INSTALLS += inst_html_docs
 
     inst_qch_docs.files = $$QMAKE_DOCS_BASE_OUTDIR/$${QMAKE_DOCS_TARGET}.qch
-    inst_qch_docs.path = $$[QT_INSTALL_DOCS]
+    inst_qch_docs.path = $$NIX_OUTPUT_DOC
     inst_qch_docs.CONFIG += no_check_exist no_default_install no_build
     INSTALLS += inst_qch_docs
 
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_example_installs.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_example_installs.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_example_installs.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_example_installs.prf	2019-07-10 09:35:08.918628595 -0500
@@ -88,7 +88,7 @@
     $$SOURCES $$HEADERS $$FORMS $$RESOURCES $$TRANSLATIONS \
     $$DBUS_ADAPTORS $$DBUS_INTERFACES
 addInstallFiles(sources.files, $$sourcefiles)
-sources.path = $$[QT_INSTALL_EXAMPLES]/$$probase
+sources.path = $$NIX_OUTPUT_DEV/share/examples/$$probase
 INSTALLS += sources
 
 check_examples {
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_functions.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_functions.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_functions.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_functions.prf	2019-07-10 09:35:08.918628595 -0500
@@ -69,7 +69,7 @@
 defineTest(qtPrepareTool) {
     cmd = $$eval(QT_TOOL.$${2}.binary)
     isEmpty(cmd) {
-        cmd = $$[QT_HOST_BINS]/$$2
+        cmd = $$system("command -v $$2")
         exists($${cmd}.pl) {
             $${1}_EXE = $${cmd}.pl
             cmd = perl -w $$system_path($${cmd}.pl)
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_installs.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_installs.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_installs.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_installs.prf	2019-07-10 09:35:08.918628595 -0500
@@ -12,16 +12,10 @@
 #library
 !qt_no_install_library {
     win32 {
-       host_build: \
-           dlltarget.path = $$[QT_HOST_BINS]
-       else: \
-           dlltarget.path = $$[QT_INSTALL_BINS]
+        dlltarget.path = $$NIX_OUTPUT_BIN/bin
        INSTALLS += dlltarget
     }
-    host_build: \
-        target.path = $$[QT_HOST_LIBS]
-    else: \
-        target.path = $$[QT_INSTALL_LIBS]
+    target.path = $$NIX_OUTPUT_OUT/lib
     !static: target.CONFIG = no_dll
     INSTALLS += target
 }
@@ -29,35 +23,35 @@
 #headers
 qt_install_headers {
     gen_headers.files = $$SYNCQT.GENERATED_HEADER_FILES
-    gen_headers.path = $$[QT_INSTALL_HEADERS]/$$MODULE_INCNAME
+    gen_headers.path = $$NIX_OUTPUT_DEV/include/$$MODULE_INCNAME
     INSTALLS += gen_headers
 
     targ_headers.files = $$SYNCQT.HEADER_FILES $$SYNCQT.INJECTED_HEADER_FILES
-    targ_headers.path = $$[QT_INSTALL_HEADERS]/$$MODULE_INCNAME
+    targ_headers.path = $$NIX_OUTPUT_DEV/include/$$MODULE_INCNAME
     INSTALLS += targ_headers
 
     private_headers.files = $$SYNCQT.PRIVATE_HEADER_FILES $$SYNCQT.INJECTED_PRIVATE_HEADER_FILES
-    private_headers.path = $$[QT_INSTALL_HEADERS]/$$MODULE_INCNAME/$$VERSION/$$MODULE_INCNAME/private
+    private_headers.path = $$NIX_OUTPUT_DEV/include/$$MODULE_INCNAME/$$VERSION/$$MODULE_INCNAME/private
     generated_privates: \
         private_headers.CONFIG += no_check_exist
     INSTALLS += private_headers
 
     qpa_headers.files = $$SYNCQT.QPA_HEADER_FILES
-    qpa_headers.path = $$[QT_INSTALL_HEADERS]/$$MODULE_INCNAME/$$VERSION/$$MODULE_INCNAME/qpa
+    qpa_headers.path = $$NIX_OUTPUT_DEV/include/$$MODULE_INCNAME/$$VERSION/$$MODULE_INCNAME/qpa
     INSTALLS += qpa_headers
 }
 
 #module
 qt_install_module {
     !isEmpty(MODULE_PRI) {
-        pritarget.path = $$[QT_HOST_DATA]/mkspecs/modules
+        pritarget.path = $$NIX_OUTPUT_DEV/mkspecs/modules
         pritarget.files = $$MODULE_PRI
         INSTALLS += pritarget
     } else: isEmpty(MODULE_PRIVATE_PRI) {
         warning("Project $$basename(_PRO_FILE_) is a module, but has not defined MODULE_PRI, which is required for Qt to expose the module to other projects.")
     }
     !isEmpty(MODULE_PRIVATE_PRI) {
-        privpritarget.path = $$[QT_HOST_DATA]/mkspecs/modules
+        privpritarget.path = $$NIX_OUTPUT_DEV/mkspecs/modules
         privpritarget.files = $$MODULE_PRIVATE_PRI
         INSTALLS += privpritarget
     }
diff -aur qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_plugin.prf qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_plugin.prf
--- qtbase-everywhere-src-5.12.3-a/mkspecs/features/qt_plugin.prf	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/mkspecs/features/qt_plugin.prf	2019-07-10 09:35:08.918628595 -0500
@@ -88,7 +88,7 @@
     }
 }
 
-target.path = $$[QT_INSTALL_PLUGINS]/$$PLUGIN_TYPE
+target.path = $$NIX_OUTPUT_PLUGIN/$$PLUGIN_TYPE
 INSTALLS += target
 
 TARGET = $$qt5LibraryTarget($$TARGET)
diff -aur qtbase-everywhere-src-5.12.3-a/src/corelib/kernel/qcoreapplication.cpp qtbase-everywhere-src-5.12.3-b/src/corelib/kernel/qcoreapplication.cpp
--- qtbase-everywhere-src-5.12.3-a/src/corelib/kernel/qcoreapplication.cpp	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/corelib/kernel/qcoreapplication.cpp	2019-07-10 09:35:08.919628625 -0500
@@ -2668,6 +2668,15 @@
         QStringList *app_libpaths = new QStringList;
         coreappdata()->app_libpaths.reset(app_libpaths);
 
+        // Add library paths derived from PATH
+        const QStringList paths = QFile::decodeName(qgetenv("PATH")).split(':');
+        const QString plugindir = QStringLiteral("../" NIXPKGS_QT_PLUGIN_PREFIX);
+        for (const QString &path: paths) {
+            if (!path.isEmpty()) {
+                app_libpaths->append(QDir::cleanPath(path + QDir::separator() + plugindir));
+            }
+        }
+
         QString libPathEnv = qEnvironmentVariable("QT_PLUGIN_PATH");
         if (!libPathEnv.isEmpty()) {
             QStringList paths = libPathEnv.split(QDir::listSeparator(), QString::SkipEmptyParts);
diff -aur qtbase-everywhere-src-5.12.3-a/src/corelib/kernel/qcore_mac_p.h qtbase-everywhere-src-5.12.3-b/src/corelib/kernel/qcore_mac_p.h
--- qtbase-everywhere-src-5.12.3-a/src/corelib/kernel/qcore_mac_p.h	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/corelib/kernel/qcore_mac_p.h	2019-07-10 09:35:08.920628655 -0500
@@ -212,7 +212,7 @@
 
 // --------------------------------------------------------------------------
 
-#if !defined(QT_BOOTSTRAPPED)
+#if 0
 
 QT_END_NAMESPACE
 #include <os/activity.h>
@@ -290,7 +290,19 @@
 
 #define QT_APPLE_SCOPED_LOG_ACTIVITY(...) QAppleLogActivity scopedLogActivity = QT_APPLE_LOG_ACTIVITY(__VA_ARGS__).enter();
 
-#endif // !defined(QT_BOOTSTRAPPED)
+#else // !defined(QT_BOOTSTRAPPED)
+
+#define QT_APPLE_LOG_ACTIVITY_WITH_PARENT3(...)
+#define QT_APPLE_LOG_ACTIVITY_WITH_PARENT2(...)
+#define QT_APPLE_LOG_ACTIVITY_WITH_PARENT(...)
+
+#define QT_APPLE_LOG_ACTIVITY2(...)
+#define QT_APPLE_LOG_ACTIVITY1(...)
+#define QT_APPLE_LOG_ACTIVITY(...)
+
+#define QT_APPLE_SCOPED_LOG_ACTIVITY(...)
+
+#endif
 
 // -------------------------------------------------------------------------
 
Only in qtbase-everywhere-src-5.12.3-b/src/corelib/kernel: qcore_mac_p.h.orig
diff -aur qtbase-everywhere-src-5.12.3-a/src/corelib/Qt5CoreConfigExtras.cmake.in qtbase-everywhere-src-5.12.3-b/src/corelib/Qt5CoreConfigExtras.cmake.in
--- qtbase-everywhere-src-5.12.3-a/src/corelib/Qt5CoreConfigExtras.cmake.in	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/corelib/Qt5CoreConfigExtras.cmake.in	2019-07-10 09:35:08.918628595 -0500
@@ -3,7 +3,7 @@
     add_executable(Qt5::qmake IMPORTED)
 
 !!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5Core_install_prefix}/$${CMAKE_BIN_DIR}qmake$$CMAKE_BIN_SUFFIX\")
+    set(imported_location \"$$NIX_OUTPUT_DEV/$${CMAKE_BIN_DIR}qmake$$CMAKE_BIN_SUFFIX\")
 !!ELSE
     set(imported_location \"$${CMAKE_BIN_DIR}qmake$$CMAKE_BIN_SUFFIX\")
 !!ENDIF
@@ -18,7 +18,7 @@
     add_executable(Qt5::moc IMPORTED)
 
 !!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5Core_install_prefix}/$${CMAKE_BIN_DIR}moc$$CMAKE_BIN_SUFFIX\")
+    set(imported_location \"$$NIX_OUTPUT_DEV/$${CMAKE_BIN_DIR}moc$$CMAKE_BIN_SUFFIX\")
 !!ELSE
     set(imported_location \"$${CMAKE_BIN_DIR}moc$$CMAKE_BIN_SUFFIX\")
 !!ENDIF
@@ -35,7 +35,7 @@
     add_executable(Qt5::rcc IMPORTED)
 
 !!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5Core_install_prefix}/$${CMAKE_BIN_DIR}rcc$$CMAKE_BIN_SUFFIX\")
+    set(imported_location \"$$NIX_OUTPUT_DEV/$${CMAKE_BIN_DIR}rcc$$CMAKE_BIN_SUFFIX\")
 !!ELSE
     set(imported_location \"$${CMAKE_BIN_DIR}rcc$$CMAKE_BIN_SUFFIX\")
 !!ENDIF
@@ -116,7 +116,7 @@
 !!IF !isEmpty(CMAKE_RELEASE_TYPE)
     set_property(TARGET Qt5::WinMain APPEND PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
 !!IF isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5Core_install_prefix}/$${CMAKE_LIB_DIR}$${CMAKE_WINMAIN_FILE_LOCATION_RELEASE}\")
+    set(imported_location \"$$NIX_OUTPUT_DEV/$${CMAKE_LIB_DIR}$${CMAKE_WINMAIN_FILE_LOCATION_RELEASE}\")
 !!ELSE
     set(imported_location \"$${CMAKE_LIB_DIR}$${CMAKE_WINMAIN_FILE_LOCATION_RELEASE}\")
 !!ENDIF
@@ -130,7 +130,7 @@
     set_property(TARGET Qt5::WinMain APPEND PROPERTY IMPORTED_CONFIGURATIONS DEBUG)
 
 !!IF isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5Core_install_prefix}/$${CMAKE_LIB_DIR}$${CMAKE_WINMAIN_FILE_LOCATION_DEBUG}\")
+    set(imported_location \"$$NIX_OUTPUT_DEV/$${CMAKE_LIB_DIR}$${CMAKE_WINMAIN_FILE_LOCATION_DEBUG}\")
 !!ELSE
     set(imported_location \"$${CMAKE_LIB_DIR}$${CMAKE_WINMAIN_FILE_LOCATION_DEBUG}\")
 !!ENDIF
diff -aur qtbase-everywhere-src-5.12.3-a/src/corelib/Qt5CoreConfigExtrasMkspecDir.cmake.in qtbase-everywhere-src-5.12.3-b/src/corelib/Qt5CoreConfigExtrasMkspecDir.cmake.in
--- qtbase-everywhere-src-5.12.3-a/src/corelib/Qt5CoreConfigExtrasMkspecDir.cmake.in	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/corelib/Qt5CoreConfigExtrasMkspecDir.cmake.in	2019-07-10 09:35:08.918628595 -0500
@@ -1,6 +1,6 @@
 
 !!IF isEmpty(CMAKE_HOST_DATA_DIR_IS_ABSOLUTE)
-set(_qt5_corelib_extra_includes \"${_qt5Core_install_prefix}/$${CMAKE_HOST_DATA_DIR}/mkspecs/$${CMAKE_MKSPEC}\")
+set(_qt5_corelib_extra_includes \"$$NIX_OUTPUT_DEV/$${CMAKE_HOST_DATA_DIR}/mkspecs/$${CMAKE_MKSPEC}\")
 !!ELSE
 set(_qt5_corelib_extra_includes \"$${CMAKE_HOST_DATA_DIR}mkspecs/$${CMAKE_MKSPEC}\")
 !!ENDIF
diff -aur qtbase-everywhere-src-5.12.3-a/src/corelib/Qt5CoreConfigExtrasMkspecDirForInstall.cmake.in qtbase-everywhere-src-5.12.3-b/src/corelib/Qt5CoreConfigExtrasMkspecDirForInstall.cmake.in
--- qtbase-everywhere-src-5.12.3-a/src/corelib/Qt5CoreConfigExtrasMkspecDirForInstall.cmake.in	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/corelib/Qt5CoreConfigExtrasMkspecDirForInstall.cmake.in	2019-07-10 09:35:08.918628595 -0500
@@ -1,6 +1,6 @@
 
 !!IF isEmpty(CMAKE_INSTALL_DATA_DIR_IS_ABSOLUTE)
-set(_qt5_corelib_extra_includes \"${_qt5Core_install_prefix}/$${CMAKE_INSTALL_DATA_DIR}/mkspecs/$${CMAKE_MKSPEC}\")
+set(_qt5_corelib_extra_includes \"$$NIX_OUTPUT_DEV/$${CMAKE_INSTALL_DATA_DIR}/mkspecs/$${CMAKE_MKSPEC}\")
 !!ELSE
 set(_qt5_corelib_extra_includes \"$${CMAKE_INSTALL_DATA_DIR}mkspecs/$${CMAKE_MKSPEC}\")
 !!ENDIF
diff -aur qtbase-everywhere-src-5.12.3-a/src/corelib/tools/qtimezoneprivate_tz.cpp qtbase-everywhere-src-5.12.3-b/src/corelib/tools/qtimezoneprivate_tz.cpp
--- qtbase-everywhere-src-5.12.3-a/src/corelib/tools/qtimezoneprivate_tz.cpp	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/corelib/tools/qtimezoneprivate_tz.cpp	2019-07-10 09:35:08.919628625 -0500
@@ -70,7 +70,11 @@
 // Parse zone.tab table, assume lists all installed zones, if not will need to read directories
 static QTzTimeZoneHash loadTzTimeZones()
 {
-    QString path = QStringLiteral("/usr/share/zoneinfo/zone.tab");
+    // Try TZDIR first, in case we're running on NixOS.
+    QString path = QFile::decodeName(qgetenv("TZDIR")) + QStringLiteral("/zone.tab");
+    // Fallback to traditional paths in case we are not on NixOS.
+    if (!QFile::exists(path))
+        path = QStringLiteral("/usr/share/zoneinfo/zone.tab");
     if (!QFile::exists(path))
         path = QStringLiteral("/usr/lib/zoneinfo/zone.tab");
 
@@ -644,12 +648,16 @@
         if (!tzif.open(QIODevice::ReadOnly))
             return;
     } else {
-        // Open named tz, try modern path first, if fails try legacy path
-        tzif.setFileName(QLatin1String("/usr/share/zoneinfo/") + QString::fromLocal8Bit(ianaId));
+        // Try TZDIR first, in case we're running on NixOS
+        tzif.setFileName(QFile::decodeName(qgetenv("TZDIR")) + QStringLiteral("/") + QString::fromLocal8Bit(ianaId));
         if (!tzif.open(QIODevice::ReadOnly)) {
-            tzif.setFileName(QLatin1String("/usr/lib/zoneinfo/") + QString::fromLocal8Bit(ianaId));
-            if (!tzif.open(QIODevice::ReadOnly))
-                return;
+            // Open named tz, try modern path first, if fails try legacy path
+            tzif.setFileName(QLatin1String("/usr/share/zoneinfo/") + QString::fromLocal8Bit(ianaId));
+            if (!tzif.open(QIODevice::ReadOnly)) {
+                tzif.setFileName(QLatin1String("/usr/lib/zoneinfo/") + QString::fromLocal8Bit(ianaId));
+                if (!tzif.open(QIODevice::ReadOnly))
+                    return;
+            }
         }
     }
 
diff -aur qtbase-everywhere-src-5.12.3-a/src/dbus/Qt5DBusConfigExtras.cmake.in qtbase-everywhere-src-5.12.3-b/src/dbus/Qt5DBusConfigExtras.cmake.in
--- qtbase-everywhere-src-5.12.3-a/src/dbus/Qt5DBusConfigExtras.cmake.in	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/dbus/Qt5DBusConfigExtras.cmake.in	2019-07-10 09:35:08.919628625 -0500
@@ -2,11 +2,7 @@
 if (NOT TARGET Qt5::qdbuscpp2xml)
     add_executable(Qt5::qdbuscpp2xml IMPORTED)
 
-!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5DBus_install_prefix}/$${CMAKE_BIN_DIR}qdbuscpp2xml$$CMAKE_BIN_SUFFIX\")
-!!ELSE
-    set(imported_location \"$${CMAKE_BIN_DIR}qdbuscpp2xml$$CMAKE_BIN_SUFFIX\")
-!!ENDIF
+    set(imported_location \"$$NIX_OUTPUT_DEV/bin/qdbuscpp2xml$$CMAKE_BIN_SUFFIX\")
     _qt5_DBus_check_file_exists(${imported_location})
 
     set_target_properties(Qt5::qdbuscpp2xml PROPERTIES
@@ -17,11 +13,7 @@
 if (NOT TARGET Qt5::qdbusxml2cpp)
     add_executable(Qt5::qdbusxml2cpp IMPORTED)
 
-!!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5DBus_install_prefix}/$${CMAKE_BIN_DIR}qdbusxml2cpp$$CMAKE_BIN_SUFFIX\")
-!!ELSE
-    set(imported_location \"$${CMAKE_BIN_DIR}qdbusxml2cpp$$CMAKE_BIN_SUFFIX\")
-!!ENDIF
+    set(imported_location \"$$NIX_OUTPUT_DEV/bin/qdbusxml2cpp$$CMAKE_BIN_SUFFIX\")
     _qt5_DBus_check_file_exists(${imported_location})
 
     set_target_properties(Qt5::qdbusxml2cpp PROPERTIES
diff -aur qtbase-everywhere-src-5.12.3-a/src/gui/Qt5GuiConfigExtras.cmake.in qtbase-everywhere-src-5.12.3-b/src/gui/Qt5GuiConfigExtras.cmake.in
--- qtbase-everywhere-src-5.12.3-a/src/gui/Qt5GuiConfigExtras.cmake.in	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/gui/Qt5GuiConfigExtras.cmake.in	2019-07-10 09:35:08.919628625 -0500
@@ -2,7 +2,7 @@
 !!IF !isEmpty(CMAKE_ANGLE_EGL_DLL_RELEASE)
 
 !!IF isEmpty(CMAKE_INCLUDE_DIR_IS_ABSOLUTE)
-set(Qt5Gui_EGL_INCLUDE_DIRS \"${_qt5$${CMAKE_MODULE_NAME}_install_prefix}/$$CMAKE_INCLUDE_DIR/QtANGLE\")
+set(Qt5Gui_EGL_INCLUDE_DIRS \"$$NIX_OUTPUT_DEV/$$CMAKE_INCLUDE_DIR/QtANGLE\")
 !!ELSE
 set(Qt5Gui_EGL_INCLUDE_DIRS \"$$CMAKE_INCLUDE_DIR/QtANGLE\")
 !!ENDIF
@@ -17,13 +17,13 @@
     set_property(TARGET Qt5::${TargetName} APPEND PROPERTY IMPORTED_CONFIGURATIONS ${Configuration})
 
 !!IF isEmpty(CMAKE_DLL_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5Gui_install_prefix}/$${CMAKE_DLL_DIR}${LIB_LOCATION}\")
+    set(imported_location \"$$NIX_OUTPUT_OUT/$${CMAKE_DLL_DIR}${LIB_LOCATION}\")
 !!ELSE
     set(imported_location \"$${CMAKE_DLL_DIR}${LIB_LOCATION}\")
 !!ENDIF
 
 !!IF isEmpty(CMAKE_LIB_DIR_IS_ABSOLUTE)
-    set(imported_implib \"${_qt5Gui_install_prefix}/$${CMAKE_LIB_DIR}${IMPLIB_LOCATION}\")
+    set(imported_implib \"$$NIX_OUTPUT_OUT/$${CMAKE_LIB_DIR}${IMPLIB_LOCATION}\")
 !!ELSE
     set(imported_implib \"$${CMAKE_LIB_DIR}${IMPLIB_LOCATION}\")
 !!ENDIF
diff -aur qtbase-everywhere-src-5.12.3-a/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp qtbase-everywhere-src-5.12.3-b/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp
--- qtbase-everywhere-src-5.12.3-a/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp	2019-07-10 09:35:08.919628625 -0500
@@ -265,12 +265,9 @@
     m_possibleLocations.reserve(7);
     if (qEnvironmentVariableIsSet("QTCOMPOSE"))
         m_possibleLocations.append(QString::fromLocal8Bit(qgetenv("QTCOMPOSE")));
-    m_possibleLocations.append(QStringLiteral("/usr/share/X11/locale"));
-    m_possibleLocations.append(QStringLiteral("/usr/local/share/X11/locale"));
-    m_possibleLocations.append(QStringLiteral("/usr/lib/X11/locale"));
-    m_possibleLocations.append(QStringLiteral("/usr/local/lib/X11/locale"));
     m_possibleLocations.append(QStringLiteral(X11_PREFIX "/share/X11/locale"));
     m_possibleLocations.append(QStringLiteral(X11_PREFIX "/lib/X11/locale"));
+    m_possibleLocations.append(QLatin1String(NIXPKGS_QTCOMPOSE));
 }
 
 QString TableGenerator::findComposeFile()
diff -aur qtbase-everywhere-src-5.12.3-a/src/plugins/platforms/xcb/qxcbcursor.cpp qtbase-everywhere-src-5.12.3-b/src/plugins/platforms/xcb/qxcbcursor.cpp
--- qtbase-everywhere-src-5.12.3-a/src/plugins/platforms/xcb/qxcbcursor.cpp	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/plugins/platforms/xcb/qxcbcursor.cpp	2019-07-10 09:35:08.919628625 -0500
@@ -317,10 +317,10 @@
 #if QT_CONFIG(xcb_xlib) && QT_CONFIG(library)
     static bool function_ptrs_not_initialized = true;
     if (function_ptrs_not_initialized) {
-        QLibrary xcursorLib(QLatin1String("Xcursor"), 1);
+        QLibrary xcursorLib(QLatin1String(NIXPKGS_LIBXCURSOR), 1);
         bool xcursorFound = xcursorLib.load();
         if (!xcursorFound) { // try without the version number
-            xcursorLib.setFileName(QLatin1String("Xcursor"));
+            xcursorLib.setFileName(QLatin1String(NIXPKGS_LIBXCURSOR));
             xcursorFound = xcursorLib.load();
         }
         if (xcursorFound) {
Only in qtbase-everywhere-src-5.12.3-b/src/plugins/platforms/xcb: qxcbcursor.cpp.orig
diff -aur qtbase-everywhere-src-5.12.3-a/src/plugins/platformthemes/gtk3/main.cpp qtbase-everywhere-src-5.12.3-b/src/plugins/platformthemes/gtk3/main.cpp
--- qtbase-everywhere-src-5.12.3-a/src/plugins/platformthemes/gtk3/main.cpp	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/plugins/platformthemes/gtk3/main.cpp	2019-07-10 09:35:08.919628625 -0500
@@ -39,6 +39,7 @@
 
 #include <qpa/qplatformthemeplugin.h>
 #include "qgtk3theme.h"
+#include <QFile>
 
 QT_BEGIN_NAMESPACE
 
@@ -54,8 +55,22 @@
 QPlatformTheme *QGtk3ThemePlugin::create(const QString &key, const QStringList &params)
 {
     Q_UNUSED(params);
-    if (!key.compare(QLatin1String(QGtk3Theme::name), Qt::CaseInsensitive))
+    if (!key.compare(QLatin1String(QGtk3Theme::name), Qt::CaseInsensitive)) {
+
+#ifdef NIXPKGS_QGTK3_XDG_DATA_DIRS
+        QStringList XDG_DATA_DIRS = QFile::decodeName(qgetenv("XDG_DATA_DIRS")).split(':');
+        XDG_DATA_DIRS << QLatin1String(NIXPKGS_QGTK3_XDG_DATA_DIRS);
+        qputenv("XDG_DATA_DIRS", QFile::encodeName(XDG_DATA_DIRS.join(':')));
+#endif
+
+#ifdef NIXPKGS_QGTK3_GIO_EXTRA_MODULES
+        QStringList GIO_EXTRA_MODULES = QFile::decodeName(qgetenv("GIO_EXTRA_MODULES")).split(':');
+        GIO_EXTRA_MODULES << QLatin1String(NIXPKGS_QGTK3_GIO_EXTRA_MODULES);
+        qputenv("GIO_EXTRA_MODULES", QFile::encodeName(GIO_EXTRA_MODULES.join(':')));
+#endif
+
         return new QGtk3Theme;
+    }
 
     return 0;
 }
diff -aur qtbase-everywhere-src-5.12.3-a/src/testlib/qappletestlogger.cpp qtbase-everywhere-src-5.12.3-b/src/testlib/qappletestlogger.cpp
--- qtbase-everywhere-src-5.12.3-a/src/testlib/qappletestlogger.cpp	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/testlib/qappletestlogger.cpp	2019-07-10 09:35:08.920628655 -0500
@@ -43,7 +43,7 @@
 
 QT_BEGIN_NAMESPACE
 
-#if defined(QT_USE_APPLE_UNIFIED_LOGGING)
+#if defined(QT_USE_APPLE_UNIFIED_LOGGING) && 0
 
 using namespace QTestPrivate;
 
diff -aur qtbase-everywhere-src-5.12.3-a/src/testlib/qtestassert.h qtbase-everywhere-src-5.12.3-b/src/testlib/qtestassert.h
--- qtbase-everywhere-src-5.12.3-a/src/testlib/qtestassert.h	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/testlib/qtestassert.h	2019-07-10 09:35:08.919628625 -0500
@@ -44,10 +44,13 @@
 
 QT_BEGIN_NAMESPACE
 
-
+#if defined(QT_NO_DEBUG) && !defined(QT_FORCE_ASSERTS)
+#define QTEST_ASSERT(cond) do { } while ((false) && (cond))
+#define QTEST_ASSERT_X(cond, where, what) do { } while ((false) && (cond))
+#else
 #define QTEST_ASSERT(cond) do { if (!(cond)) qt_assert(#cond,__FILE__,__LINE__); } while (false)
-
 #define QTEST_ASSERT_X(cond, where, what) do { if (!(cond)) qt_assert_x(where, what,__FILE__,__LINE__); } while (false)
+#endif
 
 QT_END_NAMESPACE
 
diff -aur qtbase-everywhere-src-5.12.3-a/src/widgets/Qt5WidgetsConfigExtras.cmake.in qtbase-everywhere-src-5.12.3-b/src/widgets/Qt5WidgetsConfigExtras.cmake.in
--- qtbase-everywhere-src-5.12.3-a/src/widgets/Qt5WidgetsConfigExtras.cmake.in	2019-04-09 04:51:26.000000000 -0500
+++ qtbase-everywhere-src-5.12.3-b/src/widgets/Qt5WidgetsConfigExtras.cmake.in	2019-07-10 09:35:08.919628625 -0500
@@ -3,7 +3,7 @@
     add_executable(Qt5::uic IMPORTED)
 
 !!IF isEmpty(CMAKE_BIN_DIR_IS_ABSOLUTE)
-    set(imported_location \"${_qt5Widgets_install_prefix}/$${CMAKE_BIN_DIR}uic$$CMAKE_BIN_SUFFIX\")
+    set(imported_location \"$$NIX_OUTPUT_DEV/$${CMAKE_BIN_DIR}uic$$CMAKE_BIN_SUFFIX\")
 !!ELSE
     set(imported_location \"$${CMAKE_BIN_DIR}uic$$CMAKE_BIN_SUFFIX\")
 !!ENDIF