[gegl] configure: require babl-0.1.68

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 84f0733cc4b394169be668f68ee89d06762fad8f
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Jul 25 15:03:45 2019 +0200

    configure: require babl-0.1.68

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index a2ee383b5..bcf4912a1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,7 +38,7 @@ m4_define([gegl_stable],
 m4_define([gimp_full_name], [Generic Graphical Library])
 
 # required versions of external libraries
-m4_define([babl_required_version], [0.1.66])
+m4_define([babl_required_version], [0.1.68])
 m4_define([cairo_required_version], [1.12.2])
 m4_define([gdk_pixbuf_required_version], [2.32.0])
 m4_define([introspection_required_version], [1.32.0])