treewide: don't use single quotes with placeholder

44 files changed, 52 insertions, 52 deletions

diff --git a/pkgs/desktops/deepin/dbus-factory/default.nix b/pkgs/desktops/deepin/dbus-factory/default.nix
index 3a0695f3fb8..2511f05c4ea 100644
--- a/pkgs/desktops/deepin/dbus-factory/default.nix
+++ b/pkgs/desktops/deepin/dbus-factory/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     go-dbus-generator
   ];
 
-  makeFlags = [ "GOPATH=${placeholder ''out''}/share/go" ];
+  makeFlags = [ "GOPATH=${placeholder "out"}/share/go" ];
 
   postPatch = ''
     sed -i -e 's:/share/gocode:/share/go:' Makefile
diff --git a/pkgs/desktops/deepin/deepin-anything/default.nix b/pkgs/desktops/deepin/deepin-anything/default.nix
index 619c66d9f5f..7c88102c5f3 100644
--- a/pkgs/desktops/deepin/deepin-anything/default.nix
+++ b/pkgs/desktops/deepin/deepin-anything/default.nix
@@ -30,7 +30,7 @@ mkDerivation rec {
 
   makeFlags = [
     "DEB_HOST_MULTIARCH="
-    "PREFIX=${placeholder ''out''}"
+    "PREFIX=${placeholder "out"}"
   ];
 
   postPatch = ''
diff --git a/pkgs/desktops/deepin/deepin-desktop-schemas/default.nix b/pkgs/desktops/deepin/deepin-desktop-schemas/default.nix
index b6c20ef7129..4f2427e8237 100644
--- a/pkgs/desktops/deepin/deepin-desktop-schemas/default.nix
+++ b/pkgs/desktops/deepin/deepin-desktop-schemas/default.nix
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
     # fix default background url
     sed -i -e 's,/usr/share/backgrounds/default_background.jpg,/usr/share/backgrounds/deepin/desktop.jpg,' \
       overrides/common/com.deepin.wrap.gnome.desktop.override
-      
+
     fixPath ${deepin-wallpapers} /usr/share/backgrounds \
       overrides/common/com.deepin.wrap.gnome.desktop.override
 
@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
     #   /usr/share/desktop-directories
   '';
 
-  makeFlags = [ "PREFIX=${placeholder ''out''}" ];
+  makeFlags = [ "PREFIX=${placeholder "out"}" ];
 
   doCheck = true;
   checkTarget = "test";
diff --git a/pkgs/desktops/deepin/deepin-gettext-tools/default.nix b/pkgs/desktops/deepin/deepin-gettext-tools/default.nix
index f4f4ae2971a..67fcc36bcef 100644
--- a/pkgs/desktops/deepin/deepin-gettext-tools/default.nix
+++ b/pkgs/desktops/deepin/deepin-gettext-tools/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     python3Packages.python
   ];
 
-  makeFlags = [ "PREFIX=${placeholder ''out''}" ];
+  makeFlags = [ "PREFIX=${placeholder "out"}" ];
 
   postPatch = ''
     sed -e 's/sudo cp/cp/' -i src/generate_mo.py
diff --git a/pkgs/desktops/deepin/deepin-gtk-theme/default.nix b/pkgs/desktops/deepin/deepin-gtk-theme/default.nix
index 4c0643a7ce5..8e2469a2c78 100644
--- a/pkgs/desktops/deepin/deepin-gtk-theme/default.nix
+++ b/pkgs/desktops/deepin/deepin-gtk-theme/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   propagatedUserEnvPkgs = [ gtk-engine-murrine ];
 
-  makeFlags = [ "PREFIX=${placeholder ''out''}" ];
+  makeFlags = [ "PREFIX=${placeholder "out"}" ];
 
   passthru.updateScript = deepin.updateScript { inherit ;name = "${pname}-${version}"; };
 
diff --git a/pkgs/desktops/deepin/deepin-icon-theme/default.nix b/pkgs/desktops/deepin/deepin-icon-theme/default.nix
index 8ecb25f5a2e..e63a228d0cb 100644
--- a/pkgs/desktops/deepin/deepin-icon-theme/default.nix
+++ b/pkgs/desktops/deepin/deepin-icon-theme/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
 
   buildTargets = "all hicolor-links";
   installTargets = "install-icons install-cursors";
-  installFlags = [ "PREFIX=${placeholder ''out''}" ];
+  installFlags = [ "PREFIX=${placeholder "out"}" ];
 
   postInstall = ''
     cp -a ./Sea ./usr/share/icons/hicolor "$out"/share/icons/
diff --git a/pkgs/desktops/deepin/deepin-sound-theme/default.nix b/pkgs/desktops/deepin/deepin-sound-theme/default.nix
index 398be55398b..e61e91fc87c 100644
--- a/pkgs/desktops/deepin/deepin-sound-theme/default.nix
+++ b/pkgs/desktops/deepin/deepin-sound-theme/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "1sw4nrn7q7wk1hpicm05apyc0mihaw42iqm52wb8ib8gm1qiylr9";
   };
 
-  makeFlags = [ "PREFIX=${placeholder ''out''}" ];
+  makeFlags = [ "PREFIX=${placeholder "out"}" ];
 
   passthru.updateScript = deepin.updateScript { inherit ;name = "${pname}-${version}"; };
 
diff --git a/pkgs/desktops/deepin/go-dbus-factory/default.nix b/pkgs/desktops/deepin/go-dbus-factory/default.nix
index 1d97991dffd..d302cc3417f 100644
--- a/pkgs/desktops/deepin/go-dbus-factory/default.nix
+++ b/pkgs/desktops/deepin/go-dbus-factory/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "06fqyad9f50gcjsjkh7929yyaprahdjhnd0dr4gl2797a7wysl3f";
   };
 
-  makeFlags = [ "PREFIX=${placeholder ''out''}" ];
+  makeFlags = [ "PREFIX=${placeholder "out"}" ];
 
   postPatch = ''
     sed -i -e 's:/share/gocode:/share/go:' Makefile
diff --git a/pkgs/desktops/deepin/go-dbus-generator/default.nix b/pkgs/desktops/deepin/go-dbus-generator/default.nix
index 2c63fd5ebe6..12562976490 100644
--- a/pkgs/desktops/deepin/go-dbus-generator/default.nix
+++ b/pkgs/desktops/deepin/go-dbus-generator/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   ];
 
   makeFlags = [
-    "PREFIX=${placeholder ''out''}"
+    "PREFIX=${placeholder "out"}"
     "GOCACHE=$(TMPDIR)/go-cache"
   ];
 
diff --git a/pkgs/desktops/deepin/go-gir-generator/default.nix b/pkgs/desktops/deepin/go-gir-generator/default.nix
index 68504d756b1..2f431bd941b 100644
--- a/pkgs/desktops/deepin/go-gir-generator/default.nix
+++ b/pkgs/desktops/deepin/go-gir-generator/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   '';
 
   makeFlags = [
-    "PREFIX=${placeholder ''out''}"
+    "PREFIX=${placeholder "out"}"
     "GOCACHE=$(TMPDIR)/go-cache"
   ];
 
diff --git a/pkgs/desktops/deepin/qt5dxcb-plugin/default.nix b/pkgs/desktops/deepin/qt5dxcb-plugin/default.nix
index d76bed1b9b7..4d0240c426b 100644
--- a/pkgs/desktops/deepin/qt5dxcb-plugin/default.nix
+++ b/pkgs/desktops/deepin/qt5dxcb-plugin/default.nix
@@ -25,7 +25,7 @@ mkDerivation rec {
   ];
 
   qmakeFlags = [
-    "INSTALL_PATH=${placeholder ''out''}/${qtbase.qtPluginPrefix}/platforms"
+    "INSTALL_PATH=${placeholder "out"}/${qtbase.qtPluginPrefix}/platforms"
   ];
 
   enableParallelBuilding = true;
diff --git a/pkgs/desktops/gnome-3/core/gnome-keyring/default.nix b/pkgs/desktops/gnome-3/core/gnome-keyring/default.nix
index 4148843d4ab..7817936bfda 100644
--- a/pkgs/desktops/gnome-3/core/gnome-keyring/default.nix
+++ b/pkgs/desktops/gnome-3/core/gnome-keyring/default.nix
@@ -23,8 +23,8 @@ stdenv.mkDerivation rec {
   ];
 
   configureFlags = [
-    "--with-pkcs11-config=${placeholder ''out''}/etc/pkcs11/" # installation directories
-    "--with-pkcs11-modules=${placeholder ''out''}/lib/pkcs11/"
+    "--with-pkcs11-config=${placeholder "out"}/etc/pkcs11/" # installation directories
+    "--with-pkcs11-modules=${placeholder "out"}/lib/pkcs11/"
   ];
 
   postPatch = ''
diff --git a/pkgs/desktops/gnome-3/core/gnome-user-share/default.nix b/pkgs/desktops/gnome-3/core/gnome-user-share/default.nix
index 65f9fb0db80..2a425acb067 100644
--- a/pkgs/desktops/gnome-3/core/gnome-user-share/default.nix
+++ b/pkgs/desktops/gnome-3/core/gnome-user-share/default.nix
@@ -34,8 +34,8 @@ stdenv.mkDerivation rec {
   configureFlags = [
     "--with-httpd=${apacheHttpd.out}/bin/httpd"
     "--with-modules-path=${apacheHttpd.dev}/modules"
-    "--with-systemduserunitdir=${placeholder ''out''}/etc/systemd/user"
-    "--with-nautilusdir=${placeholder ''out''}/lib/nautilus/extensions-3.0"
+    "--with-systemduserunitdir=${placeholder "out"}/etc/systemd/user"
+    "--with-nautilusdir=${placeholder "out"}/lib/nautilus/extensions-3.0"
   ];
 
   nativeBuildInputs = [
diff --git a/pkgs/desktops/gnome-3/extensions/taskwhisperer/default.nix b/pkgs/desktops/gnome-3/extensions/taskwhisperer/default.nix
index 745541b7cf4..d5bc0bbc83d 100644
--- a/pkgs/desktops/gnome-3/extensions/taskwhisperer/default.nix
+++ b/pkgs/desktops/gnome-3/extensions/taskwhisperer/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   uuid = "taskwhisperer-extension@infinicode.de";
 
   makeFlags = [
-    "INSTALLBASE=${placeholder ''out''}/share/gnome-shell/extensions"
+    "INSTALLBASE=${placeholder "out"}/share/gnome-shell/extensions"
   ];
 
   patches = [
diff --git a/pkgs/desktops/gnome-3/misc/gnome-applets/default.nix b/pkgs/desktops/gnome-3/misc/gnome-applets/default.nix
index 7bb162b7b8b..25e1347f1c9 100644
--- a/pkgs/desktops/gnome-3/misc/gnome-applets/default.nix
+++ b/pkgs/desktops/gnome-3/misc/gnome-applets/default.nix
@@ -68,7 +68,7 @@ in stdenv.mkDerivation rec {
   doCheck = true;
 
   configureFlags = [
-    "--with-libpanel-applet-dir=${placeholder ''out''}/share/gnome-panel/applets"
+    "--with-libpanel-applet-dir=${placeholder "out"}/share/gnome-panel/applets"
   ];
 
   passthru = {
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/a11y/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/a11y/default.nix
index 3b85b123fd0..7a79f72f1a2 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/a11y/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/a11y/default.nix
@@ -51,7 +51,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Universal Access Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/about/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/about/default.nix
index bd6df460c04..3247aed4993 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/about/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/about/default.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
     ./remove-update-button.patch
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard About Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/applications/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/applications/default.nix
index dca9cc662a2..ddb589c9e79 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/applications/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/applications/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Applications Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/bluetooth/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/bluetooth/default.nix
index d1663ad48cd..9f1c75b7b43 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/bluetooth/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/bluetooth/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Bluetooth Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix
index fb7ea18e88b..c0c7bbdec2e 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix
@@ -55,7 +55,7 @@ stdenv.mkDerivation rec {
     ./clock-format.patch
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Date & Time Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/display/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/display/default.nix
index c15abfd8cb8..76cfe61fc77 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/display/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/display/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Displays Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/keyboard/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/keyboard/default.nix
index ba753af7e20..8b82543a0e5 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/keyboard/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/keyboard/default.nix
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Keyboard Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/mouse-touchpad/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/mouse-touchpad/default.nix
index 00579c54525..7e572e2326b 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/mouse-touchpad/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/mouse-touchpad/default.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Mouse & Touchpad Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/network/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/network/default.nix
index 09d6da4f246..b3e4879fdae 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/network/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/network/default.nix
@@ -55,7 +55,7 @@ stdenv.mkDerivation rec {
   ];
 
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Networking Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/notifications/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/notifications/default.nix
index e547f22fec1..a6112495469 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/notifications/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/notifications/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Notifications Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/pantheon-shell/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/pantheon-shell/default.nix
index b9fad17c2f7..6046a4d2125 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/pantheon-shell/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/pantheon-shell/default.nix
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
   '';
 
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Desktop Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/power/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/power/default.nix
index 461ddcd3764..ea197643b95 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/power/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/power/default.nix
@@ -64,10 +64,10 @@ stdenv.mkDerivation rec {
       --subst-var-by GSD_GSETTINGS_PATH ${elementary-settings-daemon}/share/gsettings-schemas/${elementary-settings-daemon.name}/glib-2.0/schemas
   '';
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
-  PKG_CONFIG_DBUS_1_SYSTEM_BUS_SERVICES_DIR = "${placeholder ''out''}/share/dbus-1/system-services";
-  PKG_CONFIG_DBUS_1_SYSCONFDIR = "${placeholder ''out''}/etc";
-  PKG_CONFIG_POLKIT_GOBJECT_1_POLICYDIR = "${placeholder ''out''}/share/polkit-1/actions";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
+  PKG_CONFIG_DBUS_1_SYSTEM_BUS_SERVICES_DIR = "${placeholder "out"}/share/dbus-1/system-services";
+  PKG_CONFIG_DBUS_1_SYSCONFDIR = "${placeholder "out"}/etc";
+  PKG_CONFIG_POLKIT_GOBJECT_1_POLICYDIR = "${placeholder "out"}/share/polkit-1/actions";
 
   meta = with stdenv.lib; {
     description = "Switchboard Power Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/printers/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/printers/default.nix
index 5c303e04982..d1feaaf0ea4 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/printers/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/printers/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Printers Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/security-privacy/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/security-privacy/default.nix
index 19967c3bce0..04214054616 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/security-privacy/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/security-privacy/default.nix
@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
     zeitgeist
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   patches = [
     ./hardcode-gsettings.patch
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/sharing/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/sharing/default.nix
index b4aafb27006..87ae233916d 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/sharing/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/sharing/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Sharing Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/sound/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/sound/default.nix
index ed3518c764f..dee2f851e3f 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/sound/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/sound/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Sound Plug";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/applications-menu/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/applications-menu/default.nix
index 9f40c0f9e58..ae138c9215c 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/applications-menu/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/applications-menu/default.nix
@@ -70,11 +70,11 @@ stdenv.mkDerivation rec {
    ];
 
   mesonFlags = [
-    "--sysconfdir=${placeholder ''out''}/etc"
+    "--sysconfdir=${placeholder "out"}/etc"
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   patches = [
     (substituteAll {
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/bluetooth/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/bluetooth/default.nix
index 7e73adcd7e9..36d1cf0e77a 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/bluetooth/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/bluetooth/default.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   postPatch = ''
     chmod +x meson/post_install.py
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/datetime/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/datetime/default.nix
index 1ab3c579e14..74408a4ed6d 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/datetime/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/datetime/default.nix
@@ -71,7 +71,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   postPatch = ''
     chmod +x meson/post_install.py
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/keyboard/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/keyboard/default.nix
index 00a57cb9943..5431b982f54 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/keyboard/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/keyboard/default.nix
@@ -59,7 +59,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Keyboard Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/network/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/network/default.nix
index d5ce97df509..6ba19ebf77e 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/network/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/network/default.nix
@@ -50,7 +50,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Network Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/nightlight/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/nightlight/default.nix
index 0eab02bf8c8..0327d5e78e2 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/nightlight/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/nightlight/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Night Light Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/notifications/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/notifications/default.nix
index 78c901a2306..a4266a6f459 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/notifications/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/notifications/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Notifications Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/power/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/power/default.nix
index f63cca74a4d..9f9d4703060 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/power/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/power/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   postPatch = ''
     chmod +x meson/post_install.py
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/session/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/session/default.nix
index b363cb5485a..f48638ff2b1 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/session/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/session/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Session Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/sound/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/sound/default.nix
index 6d0e791d1e4..038ab75094c 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/sound/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/sound/default.nix
@@ -56,7 +56,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   postPatch = ''
     chmod +x meson/post_install.py
diff --git a/pkgs/desktops/pantheon/services/contractor/default.nix b/pkgs/desktops/pantheon/services/contractor/default.nix
index 6401b96a2ea..b10e97f77d7 100644
--- a/pkgs/desktops/pantheon/services/contractor/default.nix
+++ b/pkgs/desktops/pantheon/services/contractor/default.nix
@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
     libgee
   ];
 
-  PKG_CONFIG_DBUS_1_SESSION_BUS_SERVICES_DIR = "${placeholder ''out''}/share/dbus-1/services";
+  PKG_CONFIG_DBUS_1_SESSION_BUS_SERVICES_DIR = "${placeholder "out"}/share/dbus-1/services";
 
   meta = with stdenv.lib; {
     description = "A desktop-wide extension service used by elementary OS";
diff --git a/pkgs/desktops/surf-display/default.nix b/pkgs/desktops/surf-display/default.nix
index f3554fe0b40..47b7e117206 100644
--- a/pkgs/desktops/surf-display/default.nix
+++ b/pkgs/desktops/surf-display/default.nix
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
        --prefix PATH ':' ${stdenv.lib.makeBinPath buildInputs}
   '';
 
-  makeFlags = [ "PREFIX=${placeholder ''out''}" ];
+  makeFlags = [ "PREFIX=${placeholder "out"}" ];
 
   meta = with stdenv.lib; {
     description = "Kiosk browser session manager based on the surf browser";
diff --git a/pkgs/desktops/xfce4-14/xfce4-session/default.nix b/pkgs/desktops/xfce4-14/xfce4-session/default.nix
index 070f40b52d5..3361f541dc5 100644
--- a/pkgs/desktops/xfce4-14/xfce4-session/default.nix
+++ b/pkgs/desktops/xfce4-14/xfce4-session/default.nix
@@ -9,7 +9,7 @@ mkXfceDerivation rec {
 
   buildInputs = [ exo gtk3 glib libxfce4ui libxfce4util libwnck3 xfconf polkit iceauth ];
 
-  configureFlags = [ "--with-xsession-prefix=${placeholder ''out''}" ];
+  configureFlags = [ "--with-xsession-prefix=${placeholder "out"}" ];
 
   # See https://github.com/NixOS/nixpkgs/issues/36468
   NIX_CFLAGS_COMPILE = "-I${glib.dev}/include/gio-unix-2.0";