--- a/regex.c
+++ b/regex.c
@@ -3,7 +3,7 @@
    (Implements POSIX draft P10003.2/D11.2, except for
    internationalization features.)
 
-   Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
+   Copyright (C) 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -5180,7 +5180,7 @@
 /* Entry points compatible with 4.2 BSD regex library.  We don't define
    them unless specifically requested.  */
 
-#ifdef _REGEX_RE_COMP
+#if defined (_REGEX_RE_COMP) || defined (_LIBC)
 
 /* BSD has one and only one pattern buffer.  */
 static struct re_pattern_buffer re_comp_buf;
@@ -5234,6 +5234,15 @@
   return
     0 <= re_search (&re_comp_buf, s, len, 0, len, (struct re_registers *) 0);
 }
+
+#ifdef _LIBC
+/* Make these definitions weak in libc, so POSIX programs can redefine
+   these names if they don't use our functions, and still use
+   regcomp/regexec below without link errors.  */
+weak_symbol (re_comp)
+weak_symbol (re_exec)
+#endif
+
 #endif /* _REGEX_RE_COMP */
 
 /* POSIX.2 functions.  Don't define these for Emacs.  */