diff --git a/config/Makefile.in b/config/Makefile.in
index dd89044..4fc7de3 100644
--- a/config/Makefile.in
+++ b/config/Makefile.in
@@ -64,9 +64,9 @@ HOST           := @host@
 USECONFIG      := @useconfig@
 MKLIBOPTIONS   := @mkliboption@
 
-EXTRA_CFLAGS   := -Iinclude @cflags@
-EXTRA_CXXFLAGS := -Iinclude @cflags@
-EXTRA_LDFLAGS  := @ldflags@
+EXTRA_CFLAGS   := -Iinclude @cflags@ $(CFLAGS)
+EXTRA_CXXFLAGS := -Iinclude @cflags@ $(CXXFLAGS)
+EXTRA_LDFLAGS  := @ldflags@ $(LDFLAGS)
 WERROR         := @werror@
 WINRTDEBUG     := @winrtdebug@
 CTORSINITARRAY := @ctorsinitarray@