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-rw-r--r--src/mkcustom.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mkcustom.h b/src/mkcustom.h
index 035c50b7..c7c3ff13 100644
--- a/src/mkcustom.h
+++ b/src/mkcustom.h
@@ -36,7 +36,7 @@ this program. If not, see <https://www.gnu.org/licenses/>. */
# ifdef _AIX
#pragma alloca
# else
-# if !defined(__GNUC__) && !defined(WINDOWS32)
+# if !defined(__GNUC__) && !MK_OS_W32
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif