--- a/configure
+++ b/configure
@@ -31446,7 +31446,7 @@ if test "${with_rrdtool+set}" = set; the
   withval=$with_rrdtool; 	if test "x$withval" != "xno" && test "x$withval" != "xyes"
 	then
 		librrd_cflags="-I$withval/include"
-		librrd_ldflags="-L$withval/lib"
+		librrd_ldflags="-L$withval/lib -lz"
 		with_rrdtool="yes"
 	else
 		with_rrdtool="$withval"