--- configure.ac.jx 2010-04-09 21:49:03.000000000 -0400
+++ configure.ac 2011-04-01 13:24:14.000000000 -0400
@@ -454,6 +454,7 @@
AM_CONDITIONAL(HAS_XDM_AUTH, test x$xdmauth = xyes -a x$xdmauth_enable != xno)
AC_SEARCH_LIBS(crypt, crypt)
+AC_SEARCH_LIBS([dlopen], [dl])
AC_SUBST(XDM_CFLAGS)
AC_SUBST(XDM_LIBS)