[dasher] Don't silently use GConf if GSettings requested but not found.

[Patrick Welche <pwelche src gnome org>]

commit 873856638bcea9ad99ebf00e79943f3387cbc795
Author: Patrick Welche <prlw1 cam ac uk>
Date:   Wed Apr 6 15:14:39 2011 +0200

    Don't silently use GConf if GSettings requested but not found.

 configure.ac |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a0c441d..24448bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -241,6 +241,8 @@ then
 			[have_gconf=false
 			 AC_MSG_WARN([Neither a glib with GSettings, nor GConf were detected - user preferences will not be stored.])])
 		])
+	AS_IF([test "x$with_gsettings" = "xyes" -a $have_gsettings = false],
+		[AC_MSG_ERROR([GSettings requested but not found])])
 
 	# GtkBuilder's autoconnect feature requires dasher to be
 	# linked with the --export-dynamic flag. pkg-config does not