Set "not found" value for svnversion to not-found. Fixes #1463559.

configure

 #! /bin/sh
-# From configure.in Revision: 43158 .
+# From configure.in Revision: 43536 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.59 for python 2.5.
 #
@@ -1513,9 +1513,9 @@ case $ac_sys_system/$ac_sys_release in
     ;;
   # On Mac OS X 10.4, defining _POSIX_C_SOURCE or _XOPEN_SOURCE
   # disables platform specific features beyond repair.
-  # On Mac OS X 10.3, defining _POSIX_C_SOURCE or _XOPEN_SOURCE 
+  # On Mac OS X 10.3, defining _POSIX_C_SOURCE or _XOPEN_SOURCE
   # has no effect, don't bother defineing them
-  Darwin/[78].*)
+  Darwin/78.*)
     define_xopen_source=no
     ;;
 
@@ -3602,6 +3602,7 @@ do
 done
 done
 
+  test -z "$ac_cv_prog_SVNVERSION" && ac_cv_prog_SVNVERSION="not-found"
 fi
 fi
 SVNVERSION=$ac_cv_prog_SVNVERSION

configure.in

@@ -621,7 +621,7 @@ AC_SUBST(AR)
 AC_CHECK_PROGS(AR, ar aal, ar)
 
 AC_SUBST(SVNVERSION)
-AC_CHECK_PROG(SVNVERSION, svnversion, found)
+AC_CHECK_PROG(SVNVERSION, svnversion, found, not-found)
 if test $SVNVERSION = found
 then
 	SVNVERSION="svnversion \$(srcdir)"