[evolution-webcal] Bump gtk+ requirement to 2.18 as preparation for fixing bug 612469.

[Andre Klapper <aklapper src gnome org>]

commit b70dd6d0cc9995704ed57ddb511dc4ecf00c81ed
Author: Andre Klapper <a9016009 gmx de>
Date:   Wed Apr 14 16:40:40 2010 +0200

    Bump gtk+ requirement to 2.18 as preparation for fixing bug 612469.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index dffcadc..e97e19b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,7 +31,7 @@ AM_GCONF_SOURCE_2
 # EDS's libical now has an #ifndef and warns about memory management
 AC_DEFINE_UNQUOTED(HANDLE_LIBICAL_MEMORY,, [Handle libical memory])
 
-PKG_CHECK_MODULES(EVOLUTION_WEBCAL, glib-2.0 >= 2.8 gtk+-2.0 >= 2.4 libecal-1.2 >= 1.10.0 libsoup-2.4 >= 2.3.0)
+PKG_CHECK_MODULES(EVOLUTION_WEBCAL, glib-2.0 >= 2.8 gtk+-2.0 >= 2.18 libecal-1.2 >= 1.10.0 libsoup-2.4 >= 2.3.0)
 AC_SUBST(EVOLUTION_WEBCAL_CFLAGS)
 AC_SUBST(EVOLUTION_WEBCAL_LIBS)