diff --git a/util/build.sh b/util/build.sh
index f0f1e82..ef76591 100755
--- a/util/build.sh
+++ b/util/build.sh
@@ -11,7 +11,13 @@ ngx_redis_version=0.3.7
 ngx_redis_path=$home/work/nginx/ngx_http_redis-$ngx_redis_version
 
 cd $ngx_redis_path || exit 1
-patch --forward -p1 < $root/../ngx_openresty/patches/ngx_http_redis-$ngx_redis_version-variables_in_redis_pass.patch
+patch_file=$root/../openresty/patches/ngx_http_redis-$ngx_redis_version-variables_in_redis_pass.patch
+if [ ! -f $patch_file ]; then
+    echo "$patch_file: No such file" > /dev/stderr
+    exit 1
+fi
+# we ignore any errors here since the target directory might have already been patched.
+patch --forward -p1 < $patch_file
 cd $root || exit 1
 
             #--without-http_memcached_module \
@@ -33,7 +39,6 @@ ngx-build $force $version \
           --add-module=$root/../echo-nginx-module \
           --add-module=$root $opts \
           --add-module=$root/../lua-nginx-module \
-            --add-module=$home/work/nginx/ngx_http_upstream_keepalive-0.7 \
           --with-select_module \
           --with-poll_module \
           --with-debug