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-rw-r--r--src/s/vms.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/s/vms.h b/src/s/vms.h
index 413c302e8c7..6e269e61a0d 100644
--- a/src/s/vms.h
+++ b/src/s/vms.h
@@ -149,7 +149,7 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#define rindex strrchr
#define unlink delete
-#ifndef _GNUC_
+#ifndef __GNUC__
extern double mth$dmod(double, double);
#endif