[gcalctool] Fix PKG_CHECK_MODULES error

[Robert Ancell <rancell src gnome org>]

commit c86cc930e350e79ad5c5ca6db14e2734c20767dc
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue May 31 11:26:54 2011 +1000

    Fix PKG_CHECK_MODULES error

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 11f95f8..f767b20 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,7 +23,7 @@ GIO_REQUIRED=2.25.10
 GTK_REQUIRED=2.90.7
 
 PKG_CHECK_MODULES(GCALCTOOL, [
-    gtk+-3.0 $GTK_REQUIRED
+    gtk+-3.0 >= $GTK_REQUIRED
     gio-2.0 >= $GIO_REQUIRED
     libxml-2.0
     gmodule-export-2.0