--- qmake/Makefile.unix.macos.orig	2017-06-28 02:54:29.000000000 -0700
+++ qmake/Makefile.unix.macos	2017-08-27 13:44:44.000000000 -0700
@@ -2,8 +2,8 @@
 CARBON_LFLAGS = -framework ApplicationServices
 CARBON_CFLAGS = -fconstant-cfstrings
 
-EXTRA_CXXFLAGS = $(CARBON_CFLAGS)
-EXTRA_LFLAGS = $(COCOA_LFLAGS) $(CARBON_LFLAGS)
+EXTRA_CXXFLAGS = __MACPORTS_CXX_ARCH_FLAGS__ $(CARBON_CFLAGS)
+EXTRA_LFLAGS = __MACPORTS_LD_ARCH_FLAGS__ $(COCOA_LFLAGS) $(CARBON_LFLAGS)
 
 QTOBJS2 = \
     qsettings_mac.o \