diff -ur a/src/ext/openexr/CMakeLists.txt b/src/ext/openexr/CMakeLists.txt
--- a/src/ext/openexr/CMakeLists.txt	1970-01-01 09:00:01.000000000 +0900
+++ b/src/ext/openexr/CMakeLists.txt	2018-08-31 21:44:56.490714484 +0900
@@ -26,22 +26,4 @@
   ${CMAKE_CURRENT_BINARY_DIR}/IlmBase/config
 )
 
-add_custom_target(CopyIlmBaseLibs
-  COMMAND ${CMAKE_COMMAND} -E copy_directory
-  ${CMAKE_CURRENT_BINARY_DIR}/IlmBase/Half/$<CONFIGURATION>
-  ${CMAKE_CURRENT_BINARY_DIR}/OpenEXR/IlmImf/$<CONFIGURATION>
-  COMMAND ${CMAKE_COMMAND} -E copy_directory
-  ${CMAKE_CURRENT_BINARY_DIR}/IlmBase/IlmThread/$<CONFIGURATION>
-  ${CMAKE_CURRENT_BINARY_DIR}/OpenEXR/IlmImf/$<CONFIGURATION>
-  COMMAND ${CMAKE_COMMAND} -E copy_directory
-  ${CMAKE_CURRENT_BINARY_DIR}/IlmBase/Iex/$<CONFIGURATION>
-  ${CMAKE_CURRENT_BINARY_DIR}/OpenEXR/IlmImf/$<CONFIGURATION>
-  COMMAND ${CMAKE_COMMAND} -E copy_directory
-  ${CMAKE_CURRENT_BINARY_DIR}/IlmBase/Imath/$<CONFIGURATION>
-  ${CMAKE_CURRENT_BINARY_DIR}/OpenEXR/IlmImf/$<CONFIGURATION>
-)
-add_dependencies(CopyIlmBaseLibs Iex Imath IlmThread Half)
-
 add_subdirectory(OpenEXR OpenEXR)
-add_dependencies(b44ExpLogTable CopyIlmBaseLibs)
-add_dependencies(dwaLookups CopyIlmBaseLibs)