[gimp] configure.ac: require glib >= 2.54.2

[Michael Natterer <mitch src gnome org>]

commit 2b65ff45514dd74d92014eb2d191d7796cc713ca
Author: Michael Natterer <mitch gimp org>
Date:   Mon Jan 1 14:49:03 2018 +0100

    configure.ac: require glib >= 2.54.2

 app/sanity.c |    4 ++--
 configure.ac |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/app/sanity.c b/app/sanity.c
index 667ac4f..23b3d50 100644
--- a/app/sanity.c
+++ b/app/sanity.c
@@ -171,8 +171,8 @@ static gchar *
 sanity_check_glib (void)
 {
 #define GLIB_REQUIRED_MAJOR 2
-#define GLIB_REQUIRED_MINOR 36
-#define GLIB_REQUIRED_MICRO 0
+#define GLIB_REQUIRED_MINOR 54
+#define GLIB_REQUIRED_MICRO 2
 
   const gchar *mismatch = glib_check_version (GLIB_REQUIRED_MAJOR,
                                               GLIB_REQUIRED_MINOR,
diff --git a/configure.ac b/configure.ac
index 2ee38be..04429b8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,7 +45,7 @@ m4_define([gimp_full_name], [GNU Image Manipulation Program])
 # required versions of other packages
 m4_define([babl_required_version], [0.1.38])
 m4_define([gegl_required_version], [0.3.27])
-m4_define([glib_required_version], [2.40.0])
+m4_define([glib_required_version], [2.54.2])
 m4_define([atk_required_version], [2.2.0])
 m4_define([gtk_required_version], [2.24.10])
 m4_define([gtk_win32_recommended_version], [2.24.32])