diff --git a/tools/build_rocksdb_ext.sh b/tools/build_rocksdb_ext.sh
deleted file mode 100644
index 1701cac..0000000
--- a/tools/build_rocksdb_ext.sh
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/bin/bash
-
-ROCKSDB_DIR=/usr/local/rocksdb
-
-if test -z "$TARGET_OS"; then
-    TARGET_OS=`uname -s`
-fi
-
-PLATFORM_SHARED_EXT="so"
-PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
-PLATFORM_SHARED_CFLAGS="-fPIC"
-
-if [ "$TARGET_OS" = "Darwin" ]; then
-    PLATFORM_SHARED_EXT=dylib
-    PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name "
-fi
-
-SONAME=librocksdb_ext.$PLATFORM_SHARED_EXT
-
-g++ $PLATFORM_SHARED_LDFLAGS$SONAME $PLATFORM_SHARED_CFLAGS -std=c++0x -L$ROCKSDB_DIR/lib -lrocksdb -I/$ROCKSDB_DIR/include rocksdb_ext.cc -o $SONAME 
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diff --git a/tools/rocksdb_ext.cc b/tools/rocksdb_ext.cc
deleted file mode 100644
index 95713a6..0000000
--- a/tools/rocksdb_ext.cc
+++ /dev/null
@@ -1,57 +0,0 @@
-#include <rocksdb/c.h>
-#include <rocksdb/db.h>
-
-#include <string>
-
-using namespace rocksdb;
-
-extern "C" {
-
-static bool SaveError(char** errptr, const Status& s) {
-  assert(errptr != NULL);
-  if (s.ok()) {
-    return false;
-  } else if (*errptr == NULL) {
-    *errptr = strdup(s.ToString().c_str());
-  } else {
-    free(*errptr);
-    *errptr = strdup(s.ToString().c_str());
-  }
-  return true;
-}
-
-void* rocksdb_get_ext(
-    rocksdb_t* db,
-    const rocksdb_readoptions_t* options,
-    const char* key, size_t keylen,
-    char** valptr,
-    size_t* vallen,
-    char** errptr) {
-
-    std::string *tmp = new(std::string);
-
-    //very tricky, maybe changed with c++ rocksdb upgrade
-    Status s = (*(DB**)db)->Get(*(ReadOptions*)options, Slice(key, keylen), tmp);
-
-    if (s.ok()) {
-        *valptr = (char*)tmp->data();
-        *vallen = tmp->size();
-    } else {
-        delete(tmp);
-        tmp = NULL;
-        *valptr = NULL;
-        *vallen = 0;
-        if (!s.IsNotFound()) {
-            SaveError(errptr, s);
-        }
-    }
-    return tmp;
-}
-
-void rocksdb_get_free_ext(void* context) {
-    std::string* s = (std::string*)context;
-
-    delete(s);
-}
-
-}
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