1 files changed, 5 insertions, 1 deletions

diff --git a/src/config.in b/src/config.in
index 95c9993a75f..004e7620c1b 100644
--- a/src/config.in
+++ b/src/config.in
@@ -119,7 +119,6 @@ and this notice must be preserved on all copies.  */
 #undef HAVE_LONG_FILE_NAMES
 
 #undef CRAY_STACKSEG_END
-#undef STACK_DIRECTION
 
 #undef UNEXEC_SRC
 
@@ -250,6 +249,11 @@ typedef unsigned long EMACS_UINT;
    "-I/..." or something similar.  */
 #undef C_SWITCH_X_SITE
 
+/* Define STACK_DIRECTION here, but not if m/foo.h did.  */
+#ifndef STACK_DIRECTION
+#undef STACK_DIRECTION
+#endif
+
 /* Define the return type of signal handlers if the s-xxx file
    did not already do so.  */
 #define RETSIGTYPE void