Link to GLIB_LIBS, not just GTK_LIBS, to pick up gmodule on 
newer glib.
--- wireshark-1.8.0/Makefile.am
+++ wireshark-1.8.0/Makefile.am
@@ -307,11 +307,11 @@
 
 # Libraries and plugin flags with which to link wireshark.
 #
-# Note that Wireshark doesn't have to be linked with @GLIB_LIBS@, as
-# they are included in @GTK_LIBS@, and doesn't have to be linked with
-# @SOCKET_LIBS@ or @NSL_LIBS@, as those should also be included in
-# @GTK_LIBS@ (as those are also needed for X applications, and GTK+
-# applications are X applications).
+# @GTK_LIBS@ has most of @GLIB_LIBS@ but misses gmodule, which we use.
+# Wireshark doesn't have to be linked with @SOCKET_LIBS@ or
+# @NSL_LIBS@, as those should also be included in @GTK_LIBS@ (as those
+# are also needed for X applications, and GTK+ applications are X
+# applications).
 wireshark_LDADD = \
 	ui/gtk/libgtkui.a		\
 	ui/gtk/libgtkui_dirty.a		\
@@ -333,6 +333,7 @@
 	@LIBGNUTLS_LIBS@		\
 	@LIBSMI_LDFLAGS@		\
 	@PORTAUDIO_LIBS@		\
+	@GLIB_LIBS@			\
 	@GTK_LIBS@ -lm
 
 wireshark_CFLAGS = $(AM_CLEAN_CFLAGS) $(py_dissectors_dir)