diff -p -up ./panel-plugin/Makefile.am.orig ./panel-plugin/Makefile.am
--- ./panel-plugin/Makefile.am.orig	2012-06-17 10:14:27.258466523 +0000
+++ ./panel-plugin/Makefile.am	2012-06-17 10:14:45.498681553 +0000
@@ -64,6 +64,7 @@ xfce4_mailwatch_plugin_LDFLAGS = \
 	@GTHREAD_LIBS@ \
 	@LIBXFCE4PANEL_LIBS@ \
 	@LIBXFCE4UI_LIBS@ \
+	-lgcrypt \
 	@GNUTLS_LIBS@
 
 if HAVE_CYGWIN