diff --git a/winsup/mingw/ChangeLog b/winsup/mingw/ChangeLog
index f1a23e261..f3971b9a4 100644
--- a/winsup/mingw/ChangeLog
+++ b/winsup/mingw/ChangeLog
@@ -1,3 +1,8 @@
+2002-12-12  Earnie Boyd  <earnie@users.sf.net>
+
+	* include/malloc.h (_alloca): Add definition.
+	(alloca): Ditto.
+
 2002-12-08  Danny Smith  <dannysmith@users.sourceforge.net>
 
 	* mingwex/math/s_erf.c: New file.
diff --git a/winsup/mingw/include/malloc.h b/winsup/mingw/include/malloc.h
index 9c412404b..097a5e1c1 100644
--- a/winsup/mingw/include/malloc.h
+++ b/winsup/mingw/include/malloc.h
@@ -61,9 +61,15 @@ extern "C" {
    but not W9x. On latter, they always set errno to ENOSYS.
 */
 int	_heapwalk (_HEAPINFO*);
+#ifdef __GNUC__
+#define _alloca(x) __builtin_alloca((x))
+#endif
 
 #ifndef	_NO_OLDNAMES
 int	heapwalk (_HEAPINFO*);
+#ifdef __GNUC__
+#define alloca(x) __builtin_alloca((x))
+#endif
 #endif	/* Not _NO_OLDNAMES */
 
 int	_heapchk (void);	/* Verify heap integrety. */