diff --git a/src/leveldb/CMakeLists.txt b/src/leveldb/CMakeLists.txt
--- a/src/leveldb/CMakeLists.txt
+++ b/src/leveldb/CMakeLists.txt
@@ -13,27 +13,9 @@
 add_c_compiler_flag(-Wno-strict-prototypes)
 remove_compiler_flags(-Wstrict-prototypes)
 
-include(TestBigEndian)
-test_big_endian(LEVELDB_IS_BIG_ENDIAN)
-
-include(CheckIncludeFile)
-check_include_file("unistd.h" HAVE_UNISTD_H)
-
 include(CheckIncludeFileCXX)
 check_include_file_cxx("atomic" LEVELDB_ATOMIC_PRESENT)
 
-include(CheckLibraryExists)
-check_library_exists(crc32c crc32c_value "" HAVE_CRC32C)
-check_library_exists(snappy snappy_compress "" HAVE_SNAPPY)
-
-include(CheckSymbolExists)
-check_symbol_exists(fdatasync "unistd.h" HAVE_FDATASYNC)
-
-configure_file(
-  port/port_config.h.cmake.in
-  include/port/port_config.h
-)
-
 include_directories(.)
 
 add_library(leveldb
@@ -152,15 +134,6 @@
 		LEVELDB_PLATFORM_${LEVELDB_PLATFORM}
 )
 
-# Right now this is not used but the latest version of leveldb uses this
-# so we might as well be ready for it.
-if (HAVE_CRC32C)
-  target_link_libraries(leveldb crc32c)
-endif (HAVE_CRC32C)
-if (HAVE_SNAPPY)
-  target_link_libraries(leveldb snappy)
-endif (HAVE_SNAPPY)
-
 # The libmemenv library.
 add_library(memenv helpers/memenv/memenv.cc)
 target_include_directories(memenv PUBLIC include)
diff --git a/src/leveldb/port/port_config.h.cmake.in b/src/leveldb/port/port_config.h.cmake.in
deleted file mode 100644
--- a/src/leveldb/port/port_config.h.cmake.in
+++ /dev/null
@@ -1,34 +0,0 @@
-// 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_
-
-// Define to 1 if you have a definition for fdatasync() in <unistd.h>.
-#if !defined(HAVE_FUNC_FDATASYNC)
-#cmakedefine01 HAVE_FUNC_FDATASYNC
-#endif  // !defined(HAVE_FUNC_FDATASYNC)
-
-// Define to 1 if you have Google CRC32C.
-#if !defined(HAVE_CRC32C)
-#cmakedefine01 HAVE_CRC32C
-#endif  // !defined(HAVE_CRC32C)
-
-// Define to 1 if you have Google Snappy.
-#if !defined(HAVE_SNAPPY)
-#cmakedefine01 HAVE_SNAPPY
-#endif  // !defined(HAVE_SNAPPY)
-
-// Define to 1 if you have the <unistd.h> header file.
-#if !defined(HAVE_UNISTD_H)
-#cmakedefine01 HAVE_UNISTD_H
-#endif  // !defined(HAVE_UNISTD_H)
-
-// Define to 1 if your processor stores words with the most significant byte
-// first (like Motorola and SPARC, unlike Intel and VAX).
-#if !defined(LEVELDB_IS_BIG_ENDIAN)
-#cmakedefine01 LEVELDB_IS_BIG_ENDIAN
-#endif  // !defined(LEVELDB_IS_BIG_ENDIAN)
-
-#endif  // STORAGE_LEVELDB_PORT_PORT_CONFIG_H_