diff --git a/configure.ac b/configure.ac
index 5acd762..c411f8a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,6 +82,12 @@
 AC_SUBST([GNUTLS_LIBS])
 AM_CONDITIONAL([HAVE_GNUTLS], [ ! test "x$GNUTLS_LIBS" = x ])
 
+AC_CHECK_LIB([pam], [pam_start], 
+	     [PAM_LIBS='-lpam'
+	      AC_DEFINE(HAVE_PAM, 1, [PAM available])])
+AC_SUBST([PAM_LIBS])
+AM_CONDITIONAL([HAVE_PAM], [ ! test "x$PAM_LIBS" = x ])
+
 VNCCONFIG_DIR='vncconfig'
 AC_ARG_ENABLE([vncconfig],
 	AS_HELP_STRING([--enable-vncconfig],