--- libs/luajit/configure.orig
+++ libs/luajit/configure
@@ -14195,7 +14195,7 @@
     LJHOST='Other' ;;
 esac
 lj_save_CPPFLAGS=$CPPFLAGS
-CPPFLAGS="$CPPFLAGS -I$srcdir/LuaJIT-src/src $LUAJIT_DEFINES -dM"
+CPPFLAGS="$CPPFLAGS $CFLAGS -I$srcdir/LuaJIT-src/src $LUAJIT_DEFINES -dM"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <lj_arch.h>