[gcalctool] Bump GTK dependency, make GTK+3 default

[Robin Sonefors <rsonefors src gnome org>]

commit f4e556c509aef315e40d8c0b787fb36821c045df
Author: Robin Sonefors <ozamosi flukkost nu>
Date:   Sat Oct 2 20:11:27 2010 +0200

    Bump GTK dependency, make GTK+3 default

 configure.ac |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 873b629..cf8b052 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,25 +19,24 @@ dnl ###########################################################################
 dnl Dependencies
 dnl ###########################################################################
 
-GTK_REQUIRED=2.18
 GIO_REQUIRED=2.25.10
 
 AC_MSG_CHECKING([which gtk+ version to compile against])
 AC_ARG_WITH([gtk],
-  [AS_HELP_STRING([--with-gtk=2.0|3.0],[which gtk+ version to compile against (default: 2.0)])],
+  [AS_HELP_STRING([--with-gtk=2.0|3.0],[which gtk+ version to compile against (default: 3.0)])],
   [case "$with_gtk" in
      2.0|3.0) ;;
      *) AC_MSG_ERROR([invalid gtk version specified]) ;;
    esac],
-  [with_gtk=2.0])
+  [with_gtk=3.0])
 AC_MSG_RESULT([$with_gtk])
 
 case "$with_gtk" in
   2.0) GTK_API_VERSION=2.0
-       GTK_REQUIRED=2.18.0
+       GTK_REQUIRED=2.21.8
        ;;
   3.0) GTK_API_VERSION=3.0
-       GTK_REQUIRED=2.90.4
+       GTK_REQUIRED=2.90.7
        ;;
 esac