[gnome-chess] build: link against X11

[Thomas Hindoe Paaboel Andersen <thomashpa src gnome org>]

commit b0008d54676c555d5728ca64764a7fd1345eee20
Author: FrÃdÃric PÃters <fpeters 0d be>
Date:   Sat Oct 20 12:26:21 2012 +0200

    build: link against X11
    
    https://bugzilla.gnome.org/show_bug.cgi?id=686516

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index da74eac..1f753df 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,6 +25,7 @@ PKG_CHECK_MODULES(GNOME_CHESS, [
   sqlite3
   gl
   glu
+  x11
 ])
 
 PKG_CHECK_MODULES(TEST, [