diff --git a/deps/leveldb/leveldb-1.22/port/port_config.h b/deps/leveldb/leveldb-1.22/port/port_config.h
new file mode 100644
index 0000000..fe92039
--- /dev/null
+++ b/deps/leveldb/leveldb-1.22/port/port_config.h
@@ -0,0 +1,81 @@
+// Copyright 2017 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_LEVELDB_PORT_PORT_CONFIG_H_
+#define STORAGE_LEVELDB_PORT_PORT_CONFIG_H_
+
+// Check for fdatasync() in <unistd.h>.
+#if !defined(HAVE_FDATASYNC)
+#if __has_include (<unistd.h>)
+  #include <unistd.h>
+  #if defined(fdatasync)
+    #define HAVE_FDATASYNC 1
+  #else
+    #define HAVE_FDATASYNC 0
+  #endif
+#else
+  #define HAVE_FDATASYNC 0
+#endif
+#endif  // !defined(HAVE_FDATASYNC)
+
+// Check for F_FULLFSYNC in <fcntl.h>.
+#if !defined(HAVE_FULLFSYNC)
+#if __has_include (<fcntl.h>)
+  #include <fcntl.h>
+  #if defined(F_FULLFSYNC)
+    #define HAVE_FULLFSYNC 1
+  #else
+    #define HAVE_FULLFSYNC 0
+  #endif
+#else
+  #define HAVE_FULLFSYNC 0
+#endif
+#endif  // !defined(HAVE_FULLFSYNC)
+
+// Check CRC32C.
+#if !defined(HAVE_CRC32C)
+  #define HAVE_CRC32C 0
+#endif  // !defined(HAVE_CRC32C)
+
+// Check Snappy.
+#if !defined(HAVE_SNAPPY)
+  #define HAVE_SNAPPY 1
+#endif  // !defined(HAVE_SNAPPY)
+
+// Check Endianness.
+#if !defined(LEVELDB_IS_BIG_ENDIAN)
+#if defined(OS_MACOSX) || defined(OS_IOS)
+  #include <machine/endian.h>
+#if defined(__DARWIN_BIG_ENDIAN) && defined(__DARWIN_BYTE_ORDER)
+    #define LEVELDB_IS_BIG_ENDIAN \
+(__DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN)
+  #endif
+#elif defined(OS_SOLARIS)
+  #include <sys/isa_defs.h>
+  #ifdef _BIG_ENDIAN
+    #define LEVELDB_IS_BIG_ENDIAN true
+  #else
+    #define LEVELDB_IS_BIG_ENDIAN false
+  #endif
+#elif defined(OS_FREEBSD) || defined(OS_OPENBSD) ||\
+  defined(OS_NETBSD) || defined(OS_DRAGONFLYBSD)
+  #include <sys/types.h>
+  #include <sys/endian.h>
+#define LEVELDB_IS_BIG_ENDIAN (_BYTE_ORDER == _BIG_ENDIAN)
+#elif defined(OS_HPUX)
+  #define LEVELDB_IS_BIG_ENDIAN true
+#elif defined(OS_ANDROID)
+// Due to a bug in the NDK x86 <sys/endian.h> definition,
+// _BYTE_ORDER must be used instead of __BYTE_ORDER on Android.
+// See http://code.google.com/p/android/issues/detail?id=39824
+  #include <endian.h>
+#define LEVELDB_IS_BIG_ENDIAN  (_BYTE_ORDER == _BIG_ENDIAN)
+#else
+  #include <endian.h>
+#define LEVELDB_IS_BIG_ENDIAN (__BYTE_ORDER == __BIG_ENDIAN)
+#endif
+
+#endif  // !defined(LEVELDB_IS_BIG_ENDIAN)
+
+#endif  // STORAGE_LEVELDB_PORT_PORT_CONFIG_H_
diff --git a/deps/leveldb/leveldb.gyp b/deps/leveldb/leveldb.gyp
index 879dd80..4ac24fd 100644
--- a/deps/leveldb/leveldb.gyp
+++ b/deps/leveldb/leveldb.gyp
@@ -17,13 +17,7 @@
         "leveldb-<(ldbversion)/"
       ]
     },
-    "defines": [
-      "HAVE_FDATASYNC=1",
-      "HAVE_FULLFSYNC=0",
-      "HAVE_CRC32C=0",
-      "HAVE_SNAPPY=1",
-      "LEVELDB_IS_BIG_ENDIAN=0"
-    ],
+    "defines": [],
     "include_dirs": [
       "leveldb-<(ldbversion)/",
       "leveldb-<(ldbversion)/include/"
@@ -230,6 +224,7 @@
       "leveldb-<(ldbversion)/include/leveldb/table.h",
       "leveldb-<(ldbversion)/include/leveldb/write_batch.h",
       "leveldb-<(ldbversion)/port/port.h",
+      "leveldb-<(ldbversion)/port/port_config.h",
       "leveldb-<(ldbversion)/port/port_stdcxx.h",
       "leveldb-<(ldbversion)/port/thread_annotations.h",
       "leveldb-<(ldbversion)/table/block_builder.cc",