From edd3e2a83435b5e72a51d302aec95cf79d49e590 Mon Sep 17 00:00:00 2001
From: Przemyslaw Skibinski <inikep@gmail.com>
Date: Mon, 28 Nov 2016 12:46:16 +0100
Subject: [PATCH] Z_TREES only with ZLIB_VERNUM >= 0x1240

---
 zlibWrapper/README.md          | 2 +-
 zlibWrapper/zstd_zlibwrapper.c | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/zlibWrapper/README.md b/zlibWrapper/README.md
index 5fefac1d3..cbf1b1b30 100644
--- a/zlibWrapper/README.md
+++ b/zlibWrapper/README.md
@@ -137,12 +137,12 @@ Supported methods:
 - compress2
 - compressBound
 - uncompress
+- gzip file access functions
 
 Ignored methods (they do nothing):
 - deflateParams
 
 Unsupported methods:
-- gzip file access functions
 - deflateCopy
 - deflateTune
 - deflatePending
diff --git a/zlibWrapper/zstd_zlibwrapper.c b/zlibWrapper/zstd_zlibwrapper.c
index 477c53b41..3b23358f3 100644
--- a/zlibWrapper/zstd_zlibwrapper.c
+++ b/zlibWrapper/zstd_zlibwrapper.c
@@ -321,7 +321,12 @@ ZEXTERN int ZEXPORT z_deflate OF((z_streamp strm, int flush))
         strm->avail_in -= zwc->inBuffer.pos;
     }
 
-    if (flush == Z_FULL_FLUSH || flush == Z_BLOCK || flush == Z_TREES) return ZWRAPC_finishWithErrorMsg(strm, "Z_FULL_FLUSH, Z_BLOCK and Z_TREES are not supported!");
+    if (flush == Z_FULL_FLUSH 
+#if ZLIB_VERNUM >= 0x1240
+        || flush == Z_TREES 
+#endif
+        || flush == Z_BLOCK)
+        return ZWRAPC_finishWithErrorMsg(strm, "Z_FULL_FLUSH, Z_BLOCK and Z_TREES are not supported!");
 
     if (flush == Z_FINISH) {
         size_t bytesLeft;