--- /dev/null
+https://bugs.gentoo.org/546742
+https://bugs.freedesktop.org/show_bug.cgi?id=90615
+
+fix building w/gcc-5
+
+--- man/Makefile.in
++++ man/Makefile.in
+@@ -9,7 +9,7 @@
+
+ AM_CPPFLAGS = -I$(top_builddir) -I$(top_srcdir)
+ filenames.sed: filenames.sed.c
+- $(AM_V_GEN)$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
++ $(AM_V_GEN)$(CPP) -P $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
+ $(AM_CPPFLAGS) $(CPPFLAGS) $(srcdir)/filenames.sed.c | \
+ $(SED) -n -e '/s|__/ p' -e '/^\/__/ p' > $@
+