Fixing dagar's fix :)

Changing the directory prior to invoking macdeployqt so it can find the app bundle.

QGCInstaller.pri

@@ -37,7 +37,7 @@ installer {
         # qgroundcontrol.app file. If you specify a path to the .app file the symbolic
         # links to plugins will not be created correctly.
         QMAKE_POST_LINK += && mkdir -p $${DESTDIR}/package
-        QMAKE_POST_LINK += && $$dirname(QMAKE_QMAKE)/macdeployqt qgroundcontrol.app -verbose=2 -qmldir=$${BASEDIR}/src
+        QMAKE_POST_LINK += && cd $${DESTDIR} && $$dirname(QMAKE_QMAKE)/macdeployqt qgroundcontrol.app -verbose=2 -qmldir=$${BASEDIR}/src
         QMAKE_POST_LINK += && cd $${OUT_PWD}
         QMAKE_POST_LINK += && hdiutil create -layout SPUD -srcfolder $${DESTDIR}/qgroundcontrol.app -volname QGroundControl $${DESTDIR}/package/qgroundcontrol.dmg
     }