chat/libpurple transitively needs devel/glib2 for buildlink3.

Index: chat/libpurple/buildlink3.mk
===================================================================
RCS file: /cvsroot/pkgsrc/chat/libpurple/buildlink3.mk,v
retrieving revision 1.39
diff -p -u -r1.39 buildlink3.mk
--- chat/libpurple/buildlink3.mk	16 Feb 2013 11:19:23 -0000	1.39
+++ chat/libpurple/buildlink3.mk	23 Apr 2013 13:29:14 -0000
@@ -23,6 +23,8 @@ pkgbase := libpurple
 .if empty(PKG_BUILD_OPTIONS.libpurple:Mgnutls)
 .  include "../../devel/nss/buildlink3.mk"
 .endif
+
+.include "../../devel/glib2/buildlink3.mk"
 .endif # LIBPURPLE_BUILDLINK3_MK
 
 BUILDLINK_TREE+=	-libpurple