commit 61fe374a44a92621e0b75ec1f011ff1fba6c2148
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date:   Mon Sep 15 10:16:14 2014 +0530

    Remove _POSIX_REGEX_VERSION
    
    There is no _POSIX_REGEX_VERSION, so don't check for it.
    _REGEX_VERSION has been removed as well[1], so only keep the -1 return
    for backward compatibility.  I found this when trying to make the
    getconf environment variables typo-proof.
    
            * sysdeps/posix/sysconf.c (__sysconf): Return -1 for
            _SC_REGEX_VERSION.
    
    [1] http://pubs.opengroup.org/onlinepubs/009695399/functions/sysconf.html

diff --git a/sysdeps/posix/sysconf.c b/sysdeps/posix/sysconf.c
index e795b565367bdd1b..cf4f8010097e309a 100644
--- a/sysdeps/posix/sysconf.c
+++ b/sysdeps/posix/sysconf.c
@@ -983,12 +983,10 @@ __sysconf (name)
 #else
       return -1;
 #endif
+    /* _REGEX_VERSION has been removed with IEEE Std 1003.1-2001/Cor 2-2004,
+       item XSH/TC2/D6/137.  */
     case _SC_REGEX_VERSION:
-#if _POSIX_REGEX_VERSION > 0
-      return _POSIX_REGEX_VERSION;
-#else
       return -1;
-#endif
 
     case _SC_SHELL:
 #if _POSIX_SHELL > 0