--- rxvt-unicode/autogen.sh	2006/01/18 08:35:59	1.1
+++ rxvt-unicode/autogen.sh	2007/11/11 04:08:00	1.2
@@ -1,5 +1,17 @@
 #! /bin/sh
 
+if ! [ -e libev/ev++.h ]; then
+   cat <<EOF
+**
+** libev/ directory is missing
+**
+** you need a checkout of libev (http://software.schmorp.de/pkg/libev)
+** in the top-level build directory.
+**
+EOF
+   exit 1
+fi
+
 if autoheader && autoconf; then
 	rm -rf autom4te.cache
 	echo "Now run ./configure"