Fix from upstream for building with C++ compilers:
https://bugzilla.gnome.org/show_bug.cgi?id=663880

From 5d9f05eef147f17d71e38c9fba2e3f622c9ed21b Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Sat, 12 Nov 2011 10:26:31 -0500
Subject: [PATCH] glib-unix.h: Add G_BEGIN/END_DECLS

The omission was pointed out in bug 663880.
---
 glib/glib-unix.h |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/glib/glib-unix.h b/glib/glib-unix.h
index 9642b5c..7be37f0 100644
--- a/glib/glib-unix.h
+++ b/glib/glib-unix.h
@@ -38,6 +38,8 @@
 #error "This header may only be used on UNIX"
 #endif
 
+G_BEGIN_DECLS
+
 /**
  * G_UNIX_ERROR:
  *
@@ -77,4 +79,6 @@ guint    g_unix_signal_add         (gint        signum,
                                     GSourceFunc handler,
                                     gpointer    user_data);
 
-#endif
+G_END_DECLS
+
+#endif  /* __G_UNIX_H__ */
-- 
1.7.7.1