diff --git a/TARGETS b/TARGETS
index ac811dc1b8..f598af99a4 100644
--- a/TARGETS
+++ b/TARGETS
@@ -25,13 +25,16 @@ ROCKSDB_EXTERNAL_DEPS = [
     ("gflags", None, "gflags"),
     ("lz4", None, "lz4"),
     ("zstd", None),
-    ("tbb", None),
 ]
 
 ROCKSDB_OS_DEPS = [
     (
         "linux",
-        ["third-party//numa:numa", "third-party//liburing:uring"],
+        ["third-party//numa:numa", "third-party//liburing:uring", "third-party//tbb:tbb"],
+    ),
+    (
+        "macos",
+        ["third-party//tbb:tbb"],
     ),
 ]
 
@@ -49,17 +52,27 @@ ROCKSDB_OS_PREPROCESSOR_FLAGS = [
             "-DHAVE_SSE42",
             "-DLIBURING",
             "-DNUMA",
+            "-DROCKSDB_PLATFORM_POSIX",
+            "-DROCKSDB_LIB_IO_POSIX",
+            "-DTBB",
         ],
     ),
     (
         "macos",
-        ["-DOS_MACOSX"],
+        [
+            "-DOS_MACOSX",
+            "-DROCKSDB_PLATFORM_POSIX",
+            "-DROCKSDB_LIB_IO_POSIX",
+            "-DTBB",
+        ],
+    ),
+    (
+        "windows",
+        [ "-DOS_WIN", "-DWIN32", "-D_MBCS", "-DWIN64", "-DNOMINMAX" ]
     ),
 ]
 
 ROCKSDB_PREPROCESSOR_FLAGS = [
-    "-DROCKSDB_PLATFORM_POSIX",
-    "-DROCKSDB_LIB_IO_POSIX",
     "-DROCKSDB_SUPPORT_THREAD_LOCAL",
 
     # Flags to enable libs we include
@@ -70,7 +83,6 @@ ROCKSDB_PREPROCESSOR_FLAGS = [
     "-DZSTD",
     "-DZSTD_STATIC_LINKING_ONLY",
     "-DGFLAGS=gflags",
-    "-DTBB",
 
     # Added missing flags from output of build_detect_platform
     "-DROCKSDB_BACKTRACE",
@@ -246,6 +258,12 @@ cpp_library(
         "options/options_parser.cc",
         "port/port_posix.cc",
         "port/stack_trace.cc",
+        "port/win/env_default.cc",
+        "port/win/env_win.cc",
+        "port/win/io_win.cc",
+        "port/win/port_win.cc",
+        "port/win/win_logger.cc",
+        "port/win/win_thread.cc",
         "table/adaptive/adaptive_table_factory.cc",
         "table/block_based/binary_search_index_reader.cc",
         "table/block_based/block.cc",
diff --git a/buckifier/targets_builder.py b/buckifier/targets_builder.py
index 73c289a8ab..0b67e0b376 100644
--- a/buckifier/targets_builder.py
+++ b/buckifier/targets_builder.py
@@ -27,9 +27,9 @@ def pretty_list(lst, indent=8):
 class TARGETSBuilder(object):
     def __init__(self, path):
         self.path = path
-        self.targets_file = open(path, 'w')
+        self.targets_file = open(path, 'wb')
         header = targets_cfg.rocksdb_target_header_template
-        self.targets_file.write(header)
+        self.targets_file.write(header.encode("utf-8"))
         self.total_lib = 0
         self.total_bin = 0
         self.total_test = 0
@@ -52,7 +52,7 @@ class TARGETSBuilder(object):
             headers_attr_prefix=headers_attr_prefix,
             headers=headers,
             deps=pretty_list(deps),
-            extra_external_deps=extra_external_deps))
+            extra_external_deps=extra_external_deps).encode("utf-8"))
         self.total_lib = self.total_lib + 1
 
     def add_rocksdb_library(self, name, srcs, headers=None):
@@ -66,18 +66,18 @@ class TARGETSBuilder(object):
             name=name,
             srcs=pretty_list(srcs),
             headers_attr_prefix=headers_attr_prefix,
-            headers=headers))
+            headers=headers).encode("utf-8"))
         self.total_lib = self.total_lib + 1
 
     def add_binary(self, name, srcs, deps=None):
-        self.targets_file.write(targets_cfg.binary_template % (
-            name,
-            pretty_list(srcs),
-            pretty_list(deps)))
+        self.targets_file.write(targets_cfg.binary_template.format(
+            name=name,
+            srcs=pretty_list(srcs),
+            deps=pretty_list(deps)).encode("utf-8"))
         self.total_bin = self.total_bin + 1
 
     def add_c_test(self):
-        self.targets_file.write("""
+        self.targets_file.write(b"""
 if not is_opt_mode:
     cpp_binary(
         name = "c_test_bin",
@@ -119,5 +119,5 @@ if not is_opt_mode:
         self.total_test = self.total_test + 1
 
     def flush_tests(self):
-        self.targets_file.write(targets_cfg.unittests_template % self.tests_cfg)
+        self.targets_file.write(targets_cfg.unittests_template.format(tests=self.tests_cfg).encode("utf-8"))
         self.tests_cfg = ""
diff --git a/buckifier/targets_cfg.py b/buckifier/targets_cfg.py
index 1115ebdbfb..110842312b 100644
--- a/buckifier/targets_cfg.py
+++ b/buckifier/targets_cfg.py
@@ -32,13 +32,16 @@ ROCKSDB_EXTERNAL_DEPS = [
     ("gflags", None, "gflags"),
     ("lz4", None, "lz4"),
     ("zstd", None),
-    ("tbb", None),
 ]
 
 ROCKSDB_OS_DEPS = [
     (
         "linux",
-        ["third-party//numa:numa", "third-party//liburing:uring"],
+        ["third-party//numa:numa", "third-party//liburing:uring", "third-party//tbb:tbb"],
+    ),
+    (
+        "macos",
+        ["third-party//tbb:tbb"],
     ),
 ]
 
@@ -56,17 +59,27 @@ ROCKSDB_OS_PREPROCESSOR_FLAGS = [
             "-DHAVE_SSE42",
             "-DLIBURING",
             "-DNUMA",
+            "-DROCKSDB_PLATFORM_POSIX",
+            "-DROCKSDB_LIB_IO_POSIX",
+            "-DTBB",
         ],
     ),
     (
         "macos",
-        ["-DOS_MACOSX"],
+        [
+            "-DOS_MACOSX",
+            "-DROCKSDB_PLATFORM_POSIX",
+            "-DROCKSDB_LIB_IO_POSIX",
+            "-DTBB",
+        ],
+    ),
+    (
+        "windows",
+        [ "-DOS_WIN", "-DWIN32", "-D_MBCS", "-DWIN64", "-DNOMINMAX" ]
     ),
 ]
 
 ROCKSDB_PREPROCESSOR_FLAGS = [
-    "-DROCKSDB_PLATFORM_POSIX",
-    "-DROCKSDB_LIB_IO_POSIX",
     "-DROCKSDB_SUPPORT_THREAD_LOCAL",
 
     # Flags to enable libs we include
@@ -77,7 +90,6 @@ ROCKSDB_PREPROCESSOR_FLAGS = [
     "-DZSTD",
     "-DZSTD_STATIC_LINKING_ONLY",
     "-DGFLAGS=gflags",
-    "-DTBB",
 
     # Added missing flags from output of build_detect_platform
     "-DROCKSDB_BACKTRACE",
@@ -154,12 +166,12 @@ cpp_library(
 
 binary_template = """
 cpp_binary(
-    name = "%s",
-    srcs = [%s],
+    name = "{name}",
+    srcs = [{srcs}],
     arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
     compiler_flags = ROCKSDB_COMPILER_FLAGS,
     preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
-    deps = [%s],
+    deps = [{deps}],
     external_deps = ROCKSDB_EXTERNAL_DEPS,
 )
 """
@@ -176,7 +188,7 @@ test_cfg_template = """    [
 unittests_template = """
 # [test_name, test_src, test_type, extra_deps, extra_compiler_flags]
 ROCKS_TESTS = [
-%s]
+{tests}]
 
 # Generate a test rule for each entry in ROCKS_TESTS
 # Do not build the tests in opt mode, since SyncPoint and other test code
diff --git a/env/env_posix.cc b/env/env_posix.cc
index 46f1b42fdf..fd7cbec22d 100644
--- a/env/env_posix.cc
+++ b/env/env_posix.cc
@@ -6,6 +6,9 @@
 // Copyright (c) 2011 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
+
+#if !defined(OS_WIN)
+
 #include <dirent.h>
 #ifndef ROCKSDB_NO_DYNAMIC_EXTENSION
 #include <dlfcn.h>
@@ -517,3 +520,5 @@ std::unique_ptr<Env> NewCompositeEnv(std::shared_ptr<FileSystem> fs) {
 }
 
 }  // namespace ROCKSDB_NAMESPACE
+
+#endif
diff --git a/env/fs_posix.cc b/env/fs_posix.cc
index b4311c859c..5fa3d8224f 100644
--- a/env/fs_posix.cc
+++ b/env/fs_posix.cc
@@ -6,6 +6,9 @@
 // Copyright (c) 2011 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
+
+#if !defined(OS_WIN)
+
 #include <dirent.h>
 #ifndef ROCKSDB_NO_DYNAMIC_EXTENSION
 #include <dlfcn.h>
@@ -1060,3 +1063,5 @@ static FactoryFunc<FileSystem> posix_filesystem_reg =
 #endif
 
 }  // namespace ROCKSDB_NAMESPACE
+
+#endif
diff --git a/port/port_posix.cc b/port/port_posix.cc
index 4154b4fa9d..8610c6e0d5 100644
--- a/port/port_posix.cc
+++ b/port/port_posix.cc
@@ -7,6 +7,8 @@
 // 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.
 
+#if !defined(OS_WIN)
+
 #include "port/port_posix.h"
 
 #include <assert.h>
@@ -262,3 +264,5 @@ void SetCpuPriority(ThreadId id, CpuPriority priority) {
 
 }  // namespace port
 }  // namespace ROCKSDB_NAMESPACE
+
+#endif
diff --git a/port/stack_trace.cc b/port/stack_trace.cc
index 310ba77d2e..dee8bd9cea 100644
--- a/port/stack_trace.cc
+++ b/port/stack_trace.cc
@@ -5,8 +5,9 @@
 //
 #include "port/stack_trace.h"
 
-#if defined(ROCKSDB_LITE) || !(defined(ROCKSDB_BACKTRACE) || defined(OS_MACOSX)) || \
-    defined(CYGWIN) || defined(OS_FREEBSD) || defined(OS_SOLARIS)
+#if defined(ROCKSDB_LITE) ||                                                  \
+    !(defined(ROCKSDB_BACKTRACE) || defined(OS_MACOSX)) || defined(CYGWIN) || \
+    defined(OS_FREEBSD) || defined(OS_SOLARIS) || defined(OS_WIN)
 
 // noop
 
diff --git a/port/win/env_default.cc b/port/win/env_default.cc
index 663779ddec..36f95fbe34 100644
--- a/port/win/env_default.cc
+++ b/port/win/env_default.cc
@@ -7,6 +7,8 @@
 // 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.
 
+#if defined(OS_WIN)
+
 #include <mutex>
 
 #include <rocksdb/env.h>
@@ -39,3 +41,5 @@ Env* Env::Default() {
 }
 
 }  // namespace ROCKSDB_NAMESPACE
+
+#endif
diff --git a/port/win/env_win.cc b/port/win/env_win.cc
index 9c6a0208ff..f7d8f9ce3c 100644
--- a/port/win/env_win.cc
+++ b/port/win/env_win.cc
@@ -7,6 +7,8 @@
 // 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.
 
+#if defined(OS_WIN)
+
 #include "port/win/env_win.h"
 #include "port/win/win_thread.h"
 #include <algorithm>
@@ -1549,3 +1551,5 @@ std::string Env::GenerateUniqueId() {
 }
 
 }  // namespace ROCKSDB_NAMESPACE
+
+#endif
diff --git a/port/win/env_win.h b/port/win/env_win.h
index fc7402f7f9..24e3a56fe3 100644
--- a/port/win/env_win.h
+++ b/port/win/env_win.h
@@ -311,7 +311,7 @@ public:
 
   void StartThread(void(*function)(void* arg), void* arg) override;
 
-  void WaitForJoin();
+  void WaitForJoin() override;
 
   unsigned int GetThreadPoolQueueLen(Env::Priority pri) const override;
 
diff --git a/port/win/io_win.cc b/port/win/io_win.cc
index e6c6890ef8..f8d1c3dbb8 100644
--- a/port/win/io_win.cc
+++ b/port/win/io_win.cc
@@ -7,6 +7,8 @@
 // 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.
 
+#if defined(OS_WIN)
+
 #include "port/win/io_win.h"
 
 #include "monitoring/iostats_context_imp.h"
@@ -642,8 +644,8 @@ Status WinSequentialFile::Skip(uint64_t n) {
   BOOL ret = SetFilePointerEx(hFile_, li, NULL, FILE_CURRENT);
   if (ret == FALSE) {
     auto lastError = GetLastError();
-    return IOErrorFromWindowsError("Skip SetFilePointerEx():" + filename_, 
-      lastError);
+    return IOErrorFromWindowsError("Skip SetFilePointerEx():" + filename_,
+                                   lastError);
   }
   return Status::OK();
 }
@@ -767,8 +769,8 @@ Status WinWritableImpl::AppendImpl(const Slice& data) {
   Status s;
 
   if (data.size() > std::numeric_limits<DWORD>::max()) {
-    return Status::InvalidArgument("data is too long for a single write" + 
-      file_data_->GetName());
+    return Status::InvalidArgument("data is too long for a single write" +
+                                   file_data_->GetName());
   }
 
   size_t bytes_written = 0; // out param
@@ -805,8 +807,8 @@ Status WinWritableImpl::AppendImpl(const Slice& data) {
       // is sector aligned
       next_write_offset_ += bytes_written;
     } else {
-      s = Status::IOError("Failed to write all bytes: " + 
-        file_data_->GetName());
+      s = Status::IOError("Failed to write all bytes: " +
+                          file_data_->GetName());
     }
   }
 
@@ -1067,3 +1069,5 @@ WinFileLock::~WinFileLock() {
 
 }
 }  // namespace ROCKSDB_NAMESPACE
+
+#endif
diff --git a/port/win/io_win.h b/port/win/io_win.h
index 4fc2ba499b..d7aa7b4839 100644
--- a/port/win/io_win.h
+++ b/port/win/io_win.h
@@ -409,7 +409,7 @@ class WinRandomRWFile : private WinFileData,
 
   virtual Status Sync() override;
 
-  virtual Status Fsync() { return Sync(); }
+  virtual Status Fsync() override { return Sync(); }
 
   virtual Status Close() override;
 };
diff --git a/port/win/port_win.cc b/port/win/port_win.cc
index 2d99a7a9b9..16599911d8 100644
--- a/port/win/port_win.cc
+++ b/port/win/port_win.cc
@@ -7,9 +7,7 @@
 // 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.
 
-#if !defined(OS_WIN) && !defined(WIN32) && !defined(_WIN32)
-#error Windows Specific Code
-#endif
+#if defined(OS_WIN)
 
 #include "port/win/port_win.h"
 
@@ -272,3 +270,5 @@ void SetCpuPriority(ThreadId id, CpuPriority priority) {
 
 }  // namespace port
 }  // namespace ROCKSDB_NAMESPACE
+
+#endif
diff --git a/port/win/win_jemalloc.cc b/port/win/win_jemalloc.cc
index a29232f8a2..f054469ccc 100644
--- a/port/win/win_jemalloc.cc
+++ b/port/win/win_jemalloc.cc
@@ -7,6 +7,8 @@
 // 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.
 
+#if defined(OS_WIN)
+
 #ifndef ROCKSDB_JEMALLOC
 # error This file can only be part of jemalloc aware build
 #endif
@@ -73,3 +75,5 @@ void operator delete[](void* p) {
     je_free(p);
   }
 }
+
+#endif
diff --git a/port/win/win_logger.cc b/port/win/win_logger.cc
index d429a3f4a5..a9b10c04b8 100644
--- a/port/win/win_logger.cc
+++ b/port/win/win_logger.cc
@@ -10,6 +10,8 @@
 // Logger implementation that can be shared by all environments
 // where enough posix functionality is available.
 
+#if defined(OS_WIN)
+
 #include "port/win/win_logger.h"
 #include "port/win/io_win.h"
 
@@ -47,13 +49,11 @@ void WinLogger::DebugWriter(const char* str, int len) {
   BOOL ret = WriteFile(file_, str, len, &bytesWritten, NULL);
   if (ret == FALSE) {
     std::string errSz = GetWindowsErrSz(GetLastError());
-    fprintf(stderr, errSz.c_str());
+    fprintf(stderr, "%s", errSz.c_str());
   }
 }
 
-WinLogger::~WinLogger() { 
-  CloseInternal();
-}
+WinLogger::~WinLogger() { CloseInternal(); }
 
 Status WinLogger::CloseImpl() {
   return CloseInternal();
@@ -65,15 +65,13 @@ Status WinLogger::CloseInternal() {
     BOOL ret = FlushFileBuffers(file_);
     if (ret == 0) {
       auto lastError = GetLastError();
-      s = IOErrorFromWindowsError("Failed to flush LOG on Close() ", 
-        lastError);
+      s = IOErrorFromWindowsError("Failed to flush LOG on Close() ", lastError);
     }
     ret = CloseHandle(file_);
     // On error the return value is zero
     if (ret == 0 && s.ok()) {
       auto lastError = GetLastError();
-      s = IOErrorFromWindowsError("Failed to flush LOG on Close() ", 
-        lastError);
+      s = IOErrorFromWindowsError("Failed to flush LOG on Close() ", lastError);
     }
     file_ = INVALID_HANDLE_VALUE;
     closed_ = true;
@@ -163,7 +161,7 @@ void WinLogger::Logv(const char* format, va_list ap) {
       &bytesWritten, NULL);
     if (ret == FALSE) {
       std::string errSz = GetWindowsErrSz(GetLastError());
-      fprintf(stderr, errSz.c_str());
+      fprintf(stderr, "%s", errSz.c_str());
     }
 
     flush_pending_ = true;
@@ -190,3 +188,5 @@ size_t WinLogger::GetLogFileSize() const { return log_size_; }
 }
 
 }  // namespace ROCKSDB_NAMESPACE
+
+#endif
diff --git a/port/win/win_thread.cc b/port/win/win_thread.cc
index 74c667b544..2bc05e8da3 100644
--- a/port/win/win_thread.cc
+++ b/port/win/win_thread.cc
@@ -7,6 +7,8 @@
 // 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.
 
+#if defined(OS_WIN)
+
 #include "port/win/win_thread.h"
 
 #include <assert.h>
@@ -177,3 +179,5 @@ unsigned int __stdcall  WindowsThread::Data::ThreadProc(void* arg) {
 }
 } // namespace port
 }  // namespace ROCKSDB_NAMESPACE
+
+#endif
diff --git a/port/win/xpress_win.cc b/port/win/xpress_win.cc
index bcc106534d..c016d62b2c 100644
--- a/port/win/xpress_win.cc
+++ b/port/win/xpress_win.cc
@@ -7,6 +7,8 @@
 // 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.
 
+#if defined(OS_WIN)
+
 #include "port/win/xpress_win.h"
 #include <windows.h>
 
@@ -224,3 +226,5 @@ char* Decompress(const char* input_data, size_t input_length,
 }  // namespace ROCKSDB_NAMESPACE
 
 #endif
+
+#endif
diff --git a/src.mk b/src.mk
index 69dd757482..0563d7bb6d 100644
--- a/src.mk
+++ b/src.mk
@@ -129,6 +129,12 @@ LIB_SOURCES =                                                   \
   options/options_helper.cc                                     \
   options/options_parser.cc                                     \
   port/port_posix.cc                                            \
+  port/win/env_default.cc                                       \
+  port/win/env_win.cc                                           \
+  port/win/io_win.cc                                            \
+  port/win/port_win.cc                                          \
+  port/win/win_logger.cc                                        \
+  port/win/win_thread.cc                                        \
   port/stack_trace.cc                                           \
   table/adaptive/adaptive_table_factory.cc                      \
   table/block_based/binary_search_index_reader.cc               \