diff --git a/configure.ac b/configure.ac
index ae6dd9642..277ae2a12 100644
--- a/configure.ac
+++ b/configure.ac
@@ -437,7 +437,7 @@ AC_ARG_ENABLE([x11],
         [x11=auto])
 
 if test "x${x11}" != xno ; then
-    PKG_CHECK_MODULES(X11, [ x11 ],
+    PKG_CHECK_MODULES(X11, [ x11 ice sm ],
         HAVE_X11=1,
         [
             HAVE_X11=0