[nemiver] configure.ac: don't fail if gconf is missing

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 6055ad2cd21f308af1cc1e9a09708d4780b3216a
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Jun 2 16:41:10 2014 -0500

    configure.ac: don't fail if gconf is missing
    
    Since gconf has dropped to gnome-world, this macro cannot be assumed to
    exist.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 04f5a26..db99afd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -329,7 +329,7 @@ elif test x$CONF_MGR = xgconf ; then
     AC_PATH_PROG(GCONFTOOL, gconftool-2)
     AC_SUBST(GCONFTOOL)
 
-    AM_GCONF_SOURCE_2
+    m4_ifdef([AM_GCONF_SOURCE_2], [AM_GCONF_SOURCE_2])
     AC_SUBST(gsettingsschemadir, [dummy])
 else
     AC_MSG_ERROR([Configuration Manager undetermined. Abort...])