nopw svn revision works again.

SVN revision: 49344

configure.ac

@@ -3,8 +3,7 @@
 m4_define([v_maj], [0])
 m4_define([v_min], [16])
 m4_define([v_mic], [999])
-m4_define([v_rev], m4_esyscmd([svnversion . | awk -F : '{printf("%s", $1);}' | tr 'A-z' ' ' | sed 's/ //g']))
-m4_ifelse(m4_len(v_rev), [0], m4_undefine([v_rev]))
+m4_define([v_rev], m4_esyscmd([(svnversion . | grep -v exported || echo 0) | awk -F : '{printf("%s", $1);}' | tr 'A-z' ' ' | sed 's/ //g']))
 ##--   When released, remove the dnl on the below line
 dnl m4_undefine([v_rev])
 ##--   When doing snapshots - change soname. remove dnl on below line