-CPPFLAGS = $(APPEXTRACPPFLAGS) @CPPFLAGS@ @TOOLKIT_DEF@ @WXDEBUG_DEFINE@
-CFLAGS = $(APPEXTRACFLAGS) $(CPPFLAGS) @CODE_GEN_FLAGS@ @CFLAGS@
-CXXFLAGS = $(APPEXTRACXXFLAGS) $(CPPFLAGS) \
+CPPFLAGS = ${APPEXTRACPPFLAGS} @CPPFLAGS@ @TOOLKIT_DEF@ @WXDEBUG_DEFINE@
+CFLAGS = ${APPEXTRACFLAGS} ${CPPFLAGS} @CODE_GEN_FLAGS@ @CFLAGS@
+CXXFLAGS = ${APPEXTRACXXFLAGS} ${CPPFLAGS} \