diff --git a/src/make.env.in b/src/make.env.in
index f732eab79b..299c57a85b 100644
--- a/src/make.env.in
+++ b/src/make.env.in
@@ -69,8 +69,8 @@ DLLTOOL     = @DLLTOOL@
 # We *must* include CPPFLAGS in both of these, to make sure that all
 # header files get found.  (KB)
 
-CFLAGS = @TOOLKIT_DEF@ @CODE_GEN_FLAGS@ @WXDEBUG_DEFINE@ @CFLAGS@ @CPPFLAGS@
-CPPFLAGS = @TOOLKIT_DEF@ @CODE_GEN_FLAGS@ @WXDEBUG_DEFINE@ @CXXFLAGS@ @CPPFLAGS@
+CFLAGS = $(APPEXTRACFLAGS) $(APPEXTRACPPFLAGS) @TOOLKIT_DEF@ @CODE_GEN_FLAGS@ @WXDEBUG_DEFINE@ @CFLAGS@ @CPPFLAGS@
+CPPFLAGS = $(APPEXTRACXXFLAGS) $(APPEXTRACPPFLAGS) @TOOLKIT_DEF@ @CODE_GEN_FLAGS@ @WXDEBUG_DEFINE@ @CXXFLAGS@ @CPPFLAGS@
 PICFLAGS = @PIC_FLAG@
 
 # taking into account how SHARED_LD is defined, appending LDFLAGS to it