qt5 + qtwebengine + windows + mingw

functions.prf.diff

diff --git a/tools/qmake/mkspecs/features/functions.prf b/tools/qmake/mkspecs/features/functions.prf
index 4dcd8ed..2731e0f 100644
--- a/tools/qmake/mkspecs/features/functions.prf
+++ b/tools/qmake/mkspecs/features/functions.prf
@@ -90,10 +90,11 @@ defineReplace(findOrBuildNinja) {

     out = $$absolute_path("$$git_chromium_src_dir/../ninja/ninja", "$$QTWEBENGINE_ROOT")
     win32: out = $$system_path($${out}.exe)
-
+    platform = ""
+    win32-g++: platform = "--platform=mingw"
     # If we did not find ninja, then we bootstrap it.
     !exists($$out) {
-        system("python $$dirname(out)/bootstrap.py")
+        system("python $$dirname(out)/bootstrap.py $$platform")
     }
     return($$out)
 }

gyg_generator.prf.diff

diff --git a/tools/qmake/mkspecs/features/gyp_generator.prf b/tools/qmake/mkspecs/features/gyp_generator.prf
index 0b95046..13fbc98 100644
--- a/tools/qmake/mkspecs/features/gyp_generator.prf
+++ b/tools/qmake/mkspecs/features/gyp_generator.prf
@@ -21,7 +21,7 @@ defineReplace(mocAction) {
                "        'inputs': ['$$INPUT_FILE',]," \
                "        'outputs': ['$$OUTPUT_FILE',]," \
                "        'action': ["
-    for(token, MOC_COMMAND): contents += "          '$$token',"
+    for(token, MOC_COMMAND): contents += "          \"$$token\","
     contents += "          '$$INPUT_FILE'," \
                 "          '-o'," \
                 "          '$$OUTPUT_FILE'," \
@@ -41,7 +41,7 @@ defineReplace(rccAction) {
                "        'inputs': ['$$INPUT_FILE',]," \
                "        'outputs': ['$$OUTPUT_FILE',]," \
                "        'action': [" \
-               "          '$$clean_path($$QMAKE_RCC)',"
+               "          \"$$clean_path($$QMAKE_RCC)\","
     for(resource_flag, $$QMAKE_RESOURCE_FLAGS): contents += "          '$$resource_flag',"
     contents += "          '-name'," \
                 "          '$$EXTERN_FUNC'," \