g_mapped_file_free() is deprecated since glib-2.22.
================================================================================
--- devhelp-0.23/src/Makefile.am
+++ devhelp-0.23/src/Makefile.am
@@ -6,7 +6,6 @@
 	-DLOCALEDIR=\""$(datadir)/locale"\" 	  	\
 	-DDATADIR=\""$(datadir)"\"                      \
 	-DG_LOG_DOMAIN=\"Devhelp\"			\
-	-DG_DISABLE_DEPRECATED				\
 	-DGDK_DISABLE_DEPRECATED			\
 	-DGTK_DISABLE_DEPRECATED			\
 	-DG_DISABLE_SINGLE_INCLUDES			\