[libgxps] release: 0.2.3.1

[Carlos Garcia Campos <carlosgc src gnome org>]

commit b62ce7ec2845203eedc48347075175584ae364a3
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Fri Aug 14 17:49:48 2015 +0200

    release: 0.2.3.1

 NEWS         |    7 +++++++
 configure.ac |    4 ++--
 2 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 5ee23fa..5e2e942 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,10 @@
+libgxps 0.2.3.1 (14 August 2015)
+================================
+
+This is a follow up release to fix the build in some cases due to
+libpng undefined symbols.
+
+
 libgxps 0.2.3 (13 August 2015)
 ==============================
 
diff --git a/configure.ac b/configure.ac
index c444b34..b89eb3f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,8 +5,8 @@
 m4_define([gxps_major_version],[0])
 m4_define([gxps_minor_version],[2])
 m4_define([gxps_micro_version],[3])
-m4_define([gxps_extra_version],[])
-m4_define([gxps_version],[gxps_major_version.gxps_minor_version.gxps_micro_version()gxps_extra_version])
+m4_define([gxps_extra_version],[1])
+m4_define([gxps_version],[gxps_major_version.gxps_minor_version.gxps_micro_version.gxps_extra_version])
 
 # Libtool versioning. The backend and view libraries have separate versions.
 # Before making a release, the libtool version should be modified.