diff --git a/BUILD.gn b/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..7ebe16828d6c71f41de3dc3f9c8fb24ba2d60a58
--- /dev/null
+++ b/BUILD.gn
@@ -0,0 +1,50 @@
+# Copyright (c) Huawei Technologies Co., Ltd. 2019-2019. All rights reserved.
+
+import("//build/zidane.gni")
+
+config("zlib_config") {
+  include_dirs = [ "." ]
+  cflags = [
+    "-Wno-incompatible-pointer-types",
+    "-Werror",
+    "-Wimplicit-function-declaration",
+  ]
+}
+
+static_library("libz") {
+  sources = [
+    "adler32.c",
+    "compress.c",
+    "crc32.c",
+    "crc32.h",
+    "deflate.c",
+    "deflate.h",
+    "gzclose.c",
+    "gzguts.h",
+    "gzlib.c",
+    "gzread.c",
+    "gzwrite.c",
+    "infback.c",
+    "inffast.c",
+    "inffast.h",
+    "inffixed.h",
+    "inflate.h",
+    "inflate.c",
+    "inftrees.c",
+    "inftrees.h",
+    "trees.c",
+    "trees.h",
+    "uncompr.c",
+    "zconf.h",
+    "zlib.h",
+    "zutil.c",
+    "zutil.h",
+    "contrib/minizip/ioapi.c",
+    "contrib/minizip/unzip.c",
+  ]
+  public_configs = [ ":zlib_config" ]
+}
+
+static_library("libz_test") {
+  deps = [":libz"]
+}
diff --git a/gzguts.h b/gzguts.h
index 990a4d2514933709883a7d949ed52146675fe2c1..96f30c5a243073ec879368a7e1bf82e00ab5a4aa 100644
--- a/gzguts.h
+++ b/gzguts.h
@@ -30,6 +30,7 @@
 #  define _POSIX_SOURCE
 #endif
 #include <fcntl.h>
+#include <unistd.h>
 
 #ifdef _WIN32
 #  include <stddef.h>