[gimp] configure: depend on babl 0.1.40 or newer

[Øyvind Kolås <ok src gnome org>]

commit 7d5188cae65d4fdde2b8cebb5446472793fced4f
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Jan 17 16:06:10 2018 +0100

    configure: depend on babl 0.1.40 or newer

 app/sanity.c |    2 +-
 configure.ac |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/app/sanity.c b/app/sanity.c
index 364e519..9636f3a 100644
--- a/app/sanity.c
+++ b/app/sanity.c
@@ -480,7 +480,7 @@ sanity_check_babl (void)
 
 #define BABL_REQUIRED_MAJOR 0
 #define BABL_REQUIRED_MINOR 1
-#define BABL_REQUIRED_MICRO 38
+#define BABL_REQUIRED_MICRO 40
 
   babl_get_version (&babl_major_version,
                     &babl_minor_version,
diff --git a/configure.ac b/configure.ac
index 577780f..92b9990 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,7 @@ m4_define([gimp_stable],
 m4_define([gimp_full_name], [GNU Image Manipulation Program])
 
 # required versions of other packages
-m4_define([babl_required_version], [0.1.38])
+m4_define([babl_required_version], [0.1.40])
 m4_define([gegl_required_version], [0.3.27])
 m4_define([glib_required_version], [2.54.2])
 m4_define([atk_required_version], [2.2.0])