--- check_zlib.m4-orig	Mon Jul 19 15:48:27 2004
+++ check_zlib.m4	Mon Jul 19 15:53:53 2004
@@ -20,6 +20,7 @@
 dnl
 dnl @version $Id: check_zlib.m4,v 1.2 2004/03/01 19:16:57 guidod Exp $
 dnl @author Loic Dachary <address@hidden>
+dnl @patch1 Anatoly Pugachev <address@hidden>
 dnl
 
 AC_DEFUN([CHECK_ZLIB],
@@ -33,17 +34,21 @@
   --without-zlib to disable zlib usage completely],
 [if test "$withval" != no ; then
   AC_MSG_RESULT(yes)
-  ZLIB_HOME="$withval"
+  if test -d $withval
+  then
+    ZLIB_HOME="$withval"
+  else
+    AC_MSG_WARN([Sorry, $withval not exist, checking usual places])
+  fi
 else
   AC_MSG_RESULT(no)
-fi], [
-AC_MSG_RESULT(yes)
+fi])
+
 ZLIB_HOME=/usr/local
 if test ! -f "${ZLIB_HOME}/include/zlib.h"
 then
         ZLIB_HOME=/usr
 fi
-])
 
 #
 # Locate zlib, if wanted