treewide: Make explicit that 'dev' output of gtk2 is used

pkgs/applications/networking/instant-messengers/telegram/tdesktop/default.nix

@@ -46,7 +46,7 @@ in stdenv.mkDerivation rec {
     "CONFIG+=release"
     "DEFINES+=TDESKTOP_DISABLE_AUTOUPDATE"
     "DEFINES+=TDESKTOP_DISABLE_REGISTER_CUSTOM_SCHEME"
-    "INCLUDEPATH+=${gtk2}/include/gtk-2.0"
+    "INCLUDEPATH+=${gtk2.dev}/include/gtk-2.0"
     "INCLUDEPATH+=${glib.dev}/include/glib-2.0"
     "INCLUDEPATH+=${glib.out}/lib/glib-2.0/include"
     "INCLUDEPATH+=${cairo.dev}/include/cairo"

pkgs/misc/emulators/dolphin-emu/default.nix

@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   cmakeFlags = ''
     -DGTK2_GLIBCONFIG_INCLUDE_DIR=${glib.out}/lib/glib-2.0/include
     -DGTK2_GDKCONFIG_INCLUDE_DIR=${gtk2.out}/lib/gtk-2.0/include
-    -DGTK2_INCLUDE_DIRS=${gtk2}/include/gtk-2.0
+    -DGTK2_INCLUDE_DIRS=${gtk2.dev}/include/gtk-2.0
     -DCMAKE_BUILD_TYPE=Release
     -DENABLE_LTO=True
   '';

pkgs/misc/emulators/dolphin-emu/master.nix

@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   cmakeFlags = ''
     -DGTK2_GLIBCONFIG_INCLUDE_DIR=${glib.out}/lib/glib-2.0/include
     -DGTK2_GDKCONFIG_INCLUDE_DIR=${gtk2.out}/lib/gtk-2.0/include
-    -DGTK2_INCLUDE_DIRS=${gtk2}/include/gtk-2.0
+    -DGTK2_INCLUDE_DIRS=${gtk2.dev}/include/gtk-2.0
     -DCMAKE_BUILD_TYPE=Release
     -DENABLE_LTO=True
   '';

pkgs/misc/emulators/pcsx2/default.nix

@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
       -DGLSL_SHADER_DIR="$out/share/pcsx2" \
       -DGTK2_GLIBCONFIG_INCLUDE_DIR='${glib.out}/lib/glib-2.0/include' \
       -DGTK2_GDKCONFIG_INCLUDE_DIR='${gtk2.out}/lib/gtk-2.0/include' \
-      -DGTK2_INCLUDE_DIRS='${gtk2}/include/gtk-2.0' \
+      -DGTK2_INCLUDE_DIRS='${gtk2.dev}/include/gtk-2.0' \
       -DPACKAGE_MODE=TRUE \
       -DPLUGIN_DIR="$out/lib/pcsx2" \
       -DREBUILD_SHADER=TRUE \

pkgs/tools/misc/kde-gtk-config/default.nix

@@ -24,7 +24,7 @@ stdenv.mkDerivation {
   cmakeFlags = ''
     -DGTK2_GLIBCONFIG_INCLUDE_DIR=${glib.out}/lib/glib-2.0/include
     -DGTK2_GDKCONFIG_INCLUDE_DIR=${gtk2.out}/lib/gtk-2.0/include
-    -DGTK2_INCLUDE_DIRS=${gtk2}/include/gtk-2.0
+    -DGTK2_INCLUDE_DIRS=${gtk2.dev}/include/gtk-2.0
     -DKDE4_LIBEXEC_INSTALL_DIR=lib/kde4/libexec
   '';