commit 69d58c2a969ee8d98ef458683a658a6cbec0e5b7
Author: Dominique Leuenberger <dimstar@opensuse.org>
Date:   Mon Mar 30 17:03:46 2015 +0200

    Build: link libasb_plugin_font.la with GTK3
    
    Until f630bcf, linking GDKPIXBUF implicitly also linked against gtk+-3.0
    libappstream-builder itself is linked against the whole stack, but when linking
    using -Wl,--as-needed, the library references to cairo and gdk are dropped for
    not being used. Hence, let's explicitly link the font-plugin against GTK.

diff --git a/libappstream-builder/plugins/Makefile.am b/libappstream-builder/plugins/Makefile.am
index 695bebc..71bc44b 100644
--- a/libappstream-builder/plugins/Makefile.am
+++ b/libappstream-builder/plugins/Makefile.am
@@ -125,7 +125,7 @@ libasb_plugin_ibus_xml_la_LDFLAGS = -module -avoid-version
 libasb_plugin_ibus_xml_la_CFLAGS = $(GLIB_CFLAGS) $(WARNINGFLAGS_C)
 
 libasb_plugin_font_la_SOURCES = asb-plugin-font.c
-libasb_plugin_font_la_LIBADD = $(GLIB_LIBS) $(FREETYPE_LIBS) $(GDKPIXBUF_LIBS)
+libasb_plugin_font_la_LIBADD = $(GLIB_LIBS) $(FREETYPE_LIBS) $(GDKPIXBUF_LIBS) $(GTK_LIBS)
 libasb_plugin_font_la_LDFLAGS = -module -avoid-version
 libasb_plugin_font_la_CFLAGS = $(GLIB_CFLAGS) $(GTK_CFLAGS) $(WARNINGFLAGS_C)