+# We need to pass all qmake related variables to $(MAKE) as well, as (generated) Makefiles may invoke qmake once again for creating further Makefiles.
+# Actually we'd also like to pass $MAKE_VARS and $MAKE_FLAGS to also make ordinary non-qmake generated Makefiles calling toolchain executables
+# like $CC/$CXX/.. work, however this would interfere with qmake generated Makefiles, since they expect variables being set differently.
+# For example qmake generated Makefiles expect $AR to also contain ar's arguments, while ordinary Makefiles don't.
+# Until we find a way to disginguish both kinds of Makefiles, we will neglect ordinary Makefiles calling toolchain executables.
+# Mixing qmake generated and ordinary Makfiles - both calling toolchain executables - is probably a very rare case anyway.