[gcalctool] Fix valac dependency issue

[Robert Ancell <rancell src gnome org>]

commit f02c0855483597eafe301e5e896c242c3398ae19
Author: PioneerAxon <arth svnit gmail com>
Date:   Sun Oct 14 20:21:42 2012 +0530

    Fix valac dependency issue

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 60b2471..9e49ca9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6,7 +6,7 @@ AM_SILENT_RULES([yes])
 AM_MAINTAINER_MODE
 GNOME_MAINTAINER_MODE_DEFINES
 
-AM_PROG_VALAC([0.16.0])
+AM_PROG_VALAC([0.18.0])
 AM_PROG_CC_C_O
 
 GLIB_GSETTINGS