[dasher] Build with gtk3 if found, if not fall back to gtk2.

[Patrick Welche <pwelche src gnome org>]

commit 1626704ece09ed2d1879c4b9d09b43fe5177167f
Author: Patrick Welche <prlw1 cam ac uk>
Date:   Thu Mar 31 22:46:58 2011 +0200

    Build with gtk3 if found, if not fall back to gtk2.

 configure.ac |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e1004d9..b12cbc4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -197,7 +197,11 @@ AC_ARG_WITH([cairo],
 
 if test x"$WITHGTK2" = xtrue
 then 
-	PKG_CHECK_MODULES(GTK2, gtk+-2.0 >= 2.6.0,[GTK2HERE=true],[GTK2HERE=false]) 
+	PKG_CHECK_MODULES(GTK2, gtk+-3.0,
+		[GTK2HERE=true],
+		[PKG_CHECK_MODULES(GTK2, gtk+-2.0 >= 2.6.0,
+			[GTK2HERE=true],
+			[GTK2HERE=false])]) 
 fi
 
 if test x"$GTK2HERE" = xtrue -a x"$WITHQTE" != xtrue