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diff --git a/include/ac/alloca.h b/include/ac/alloca.h
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+/* Generic alloca.h */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2018 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#ifndef _AC_ALLOCA_H
+#define _AC_ALLOCA_H
+
+/*
+ * use of alloca is disallowed as it is machine dependent
+ */
+#error "alloca() not supported, use malloc()"
+
+/* AIX requires this to be the first thing in the file. */
+#ifdef __GNUC__
+# define alloca __builtin_alloca
+#else
+# ifdef HAVE_ALLOCA_H
+# include <alloca.h>
+# else
+# ifdef _AIX
+#pragma alloca
+# else
+# ifndef alloca /* predefined by HP cc +Olibcalls */
+extern char *(alloca)();
+# endif
+# endif
+# endif
+#endif
+
+
+#endif /* _AC_ALLOCA_H */