This patch force to only build the python bindings, and to do so, we modify
the setup.py file in oder that finds our compiled libraries (libleveldb.so and
libsnappy.so)
--- leveldb-0.194/setup.py.orig	2016-09-17 02:05:55.000000000 +0200
+++ leveldb-0.194/setup.py	2019-02-26 16:57:40.997435911 +0100
@@ -11,44 +11,25 @@ import platform
 import sys

 from setuptools import setup, Extension
+from os import environ

 system, node, release, version, machine, processor = platform.uname()
-common_flags = [
-    '-I./leveldb/include',
-    '-I./leveldb',
-    '-I./snappy',
+extra_compile_args = [
+    '-I{}/include'.format(environ.get('LEVELDB_BUILD_PATH')),
+    '-I{}'.format(environ.get('LEVELDB_BUILD_PATH')),
+    '-I{}'.format(environ.get('SNAPPY_BUILD_PATH')),
+    '-I.',
     '-I.',
-    '-fno-builtin-memcmp',
     '-O2',
     '-fPIC',
     '-DNDEBUG',
     '-DSNAPPY',
+    '-pthread',
+    '-Wall',
+    '-D_REENTRANT',
+    '-DOS_ANDROID',
 ]

-if system == 'Darwin':
-    extra_compile_args = common_flags + [
-        '-DOS_MACOSX',
-        '-DLEVELDB_PLATFORM_POSIX',
-        '-Wno-error=unused-command-line-argument-hard-error-in-future',
-    ]
-elif system == 'Linux':
-    extra_compile_args = common_flags + [
-        '-pthread',
-        '-Wall',
-        '-DOS_LINUX',
-        '-DLEVELDB_PLATFORM_POSIX',
-    ]
-elif system == 'SunOS':
-  extra_compile_args = common_flags + [
-      '-pthread',
-      '-Wall',
-      '-DOS_SOLARIS',
-      '-DLEVELDB_PLATFORM_POSIX',
-      ]
-else:
-    sys.stderr.write("Don't know how to compile leveldb for %s!\n" % system)
-    sys.exit(1)
-
 setup(
     name = 'leveldb',
     version = '0.194',
@@ -81,57 +62,11 @@ setup(
     ext_modules = [
         Extension('leveldb',
             sources = [
-                # snappy
-                './snappy/snappy.cc',
-                './snappy/snappy-stubs-internal.cc',
-                './snappy/snappy-sinksource.cc',
-                './snappy/snappy-c.cc',
-
-                #leveldb
-                'leveldb/db/builder.cc',
-                'leveldb/db/c.cc',
-                'leveldb/db/db_impl.cc',
-                'leveldb/db/db_iter.cc',
-                'leveldb/db/dbformat.cc',
-                'leveldb/db/filename.cc',
-                'leveldb/db/log_reader.cc',
-                'leveldb/db/log_writer.cc',
-                'leveldb/db/memtable.cc',
-                'leveldb/db/repair.cc',
-                'leveldb/db/table_cache.cc',
-                'leveldb/db/version_edit.cc',
-                'leveldb/db/version_set.cc',
-                'leveldb/db/write_batch.cc',
-                'leveldb/table/block.cc',
-                'leveldb/table/block_builder.cc',
-                'leveldb/table/filter_block.cc',
-                'leveldb/table/format.cc',
-                'leveldb/table/iterator.cc',
-                'leveldb/table/merger.cc',
-                'leveldb/table/table.cc',
-                'leveldb/table/table_builder.cc',
-                'leveldb/table/two_level_iterator.cc',
-                'leveldb/util/arena.cc',
-                'leveldb/util/bloom.cc',
-                'leveldb/util/cache.cc',
-                'leveldb/util/coding.cc',
-                'leveldb/util/comparator.cc',
-                'leveldb/util/crc32c.cc',
-                'leveldb/util/env.cc',
-                'leveldb/util/env_posix.cc',
-                'leveldb/util/filter_policy.cc',
-                'leveldb/util/hash.cc',
-                'leveldb/util/histogram.cc',
-                'leveldb/util/logging.cc',
-                'leveldb/util/options.cc',
-                'leveldb/util/status.cc',
-                'leveldb/port/port_posix.cc',
-
                 # python stuff
                 'leveldb_ext.cc',
                 'leveldb_object.cc',
             ],
-            libraries = ['stdc++'],
+            libraries = ['snappy', 'leveldb', 'stdc++', 'c++_shared'],
             extra_compile_args = extra_compile_args,
         )
     ]