--- qmake/qmake.pri.orig
+++ qmake/qmake.pri
@@ -135,7 +135,7 @@
         SOURCES += qfilesystemengine_unix.cpp qfilesystemiterator_unix.cpp qfsfileengine_unix.cpp
         mac {
           SOURCES += qcore_mac.cpp qsettings_mac.cpp
-          QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.4 #enables weak linking for 10.4 (exported)
+          QMAKE_MACOSX_DEPLOYMENT_TARGET = @MACOSX_DEPLOYMENT_TARGET@
           LIBS += -framework ApplicationServices
         }
     } else:win32 {