diff -rupN qtwebkit-fdafce4d3a4670e315c161a9ec79ae6203742d1d/Tools/qmake/mkspecs/features/win32/default_pre.prf qtwebkit-fdafce4d3a4670e315c161a9ec79ae6203742d1d-new/Tools/qmake/mkspecs/features/win32/default_pre.prf
--- qtwebkit-fdafce4d3a4670e315c161a9ec79ae6203742d1d/Tools/qmake/mkspecs/features/win32/default_pre.prf	2017-11-08 17:15:23.000000000 +0100
+++ qtwebkit-fdafce4d3a4670e315c161a9ec79ae6203742d1d-new/Tools/qmake/mkspecs/features/win32/default_pre.prf	2017-11-27 16:27:58.951226842 +0100
@@ -4,6 +4,9 @@
 # See 'Tools/qmake/README' for an overview of the build system
 # -------------------------------------------------------------------
 
+# Make sure we process the PKGCONFIG variable if applicable
+CONFIG += link_pkgconfig
+
 load(default_pre)
 
 debug: CONFIG += use_all_in_one_files