Index: ObjQt.pro
==================================================================
--- ObjQt.pro
+++ ObjQt.pro
@@ -33,11 +33,19 @@
 	   QtGui/QtPaintDevice.mm	\
 	   QtWidgets/QtAction.mm	\
 	   QtWidgets/QtApplication.mm	\
 	   QtWidgets/QtWidget.mm
 
-QMAKE_CXXFLAGS += $$system("objfw-config --cppflags --objcflags --cxxflags")
-QMAKE_CXXFLAGS_WARN_ON = -Wall					\
-			 -Werror				\
-			 -Wsemicolon-before-method-body		\
-			 -Wobjc-missing-property-synthesis
+OBJCFLAGS += $$system("objfw-config --cppflags --objcflags --cxxflags")
+OBJCFLAGS_WARN_ON = -Wall				\
+		    -Werror				\
+		    -Wsemicolon-before-method-body	\
+		    -Wobjc-missing-property-synthesis
+
+# qmake treats .mm files as C++ on Mac, but as C on everything else
+macx:QMAKE_CXXFLAGS += $$OBJCFLAGS
+macx:QMAKE_CXXFLAGS_WARN_ON = $$OBJCFLAGS_WARN_ON
+!macx:QMAKE_CC = clang++
+!macx:QMAKE_CFLAGS += -std=c++11 $$OBJCFLAGS
+!macx:QMAKE_CFLAGS_WARN_ON = $$OBJCFLAGS_WARN_ON
+
 LIBS += $$system("objfw-config --ldflags --libs")