diff --git a/gcc/config/convex/xm-convex.h b/gcc/config/convex/xm-convex.h
new file mode 100644
index 00000000000..97bb883aaa8
--- /dev/null
+++ b/gcc/config/convex/xm-convex.h
@@ -0,0 +1,61 @@
+/* Configuration for GNU C-compiler for Convex.
+   Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* #defines that need visibility everywhere.  */
+#define FALSE 0
+#define TRUE 1
+
+/* target machine dependencies.
+   tm.h is a symbolic link to the actual target specific file.   */
+#include "tm.h"
+
+/* This describes the machine the compiler is hosted on.  */
+#define HOST_BITS_PER_CHAR 8
+#define HOST_BITS_PER_SHORT 16
+#define HOST_BITS_PER_INT 32
+#define HOST_BITS_PER_LONG 32
+#define HOST_BITS_PER_LONGLONG 64
+
+/* Arguments to use with `exit'.  */
+#define SUCCESS_EXIT_CODE 0
+#define FATAL_EXIT_CODE 33
+
+/* If compiled with GNU C, use the built-in alloca */
+#ifdef __GNUC__
+#define alloca __builtin_alloca
+#endif
+
+#ifdef _POSIX_SOURCE
+
+/* Un-hide names hidden in Posix include files.  */
+
+#define S_IFMT _S_IFMT
+#define S_IFREG _S_IFREG
+
+#else
+
+/* This definition is to prevent 8.0 include files from declaring prototypes.
+   Those include files ANSIfied, but the prototypes sometimes do not match.
+   There is no effect on pre-8.0 OS versions.  */
+
+#ifndef _PROTO
+#define _PROTO(X) ()
+#endif
+
+#endif /* _POSIX_SOURCE */