diff --git a/googletest/include/gtest/internal/gtest-port.h b/googletest/include/gtest/internal/gtest-port.h
index 58c28798..f13ea49e 100644
--- a/googletest/include/gtest/internal/gtest-port.h
+++ b/googletest/include/gtest/internal/gtest-port.h
@@ -2188,7 +2188,7 @@ inline int IsATTY(int fd) {
 
 GTEST_DISABLE_DEPRECATED_PUSH_()
 
-// ChDir(), FReopen(), FDOpen(), Read(), Write(), Close(), Dup(), Dup2(), and
+// ChDir(), FReopen(), FDOpen(), Read(), Write(), Close(), and
 // StrError() aren't needed on Windows CE at this time and thus not
 // defined there.
 #if GTEST_HAS_FILE_SYSTEM
@@ -2196,13 +2196,7 @@ GTEST_DISABLE_DEPRECATED_PUSH_()
     !defined(GTEST_OS_WINDOWS_RT) && !defined(GTEST_OS_WINDOWS_GAMES) &&     \
     !defined(GTEST_OS_ESP8266) && !defined(GTEST_OS_XTENSA) &&               \
     !defined(GTEST_OS_QURT)
-inline int ChDir(const char* dir) {
-#ifdef GTEST_OS_WINDOWS
-  return _chdir(dir);
-#else
-  return chdir(dir);
-#endif
-}
+inline int ChDir(const char* dir) { return chdir(dir); }
 #endif
 inline FILE* FOpen(const char* path, const char* mode) {
 #if defined(GTEST_OS_WINDOWS) && !defined(GTEST_OS_WINDOWS_MINGW)
@@ -2219,51 +2213,17 @@ inline FILE* FOpen(const char* path, const char* mode) {
 inline FILE* FReopen(const char* path, const char* mode, FILE* stream) {
   return freopen(path, mode, stream);
 }
-inline FILE* FDOpen(int fd, const char* mode) {
-#ifdef GTEST_OS_WINDOWS
-  return _fdopen(fd, mode);
-#else
-  return fdopen(fd, mode);
-#endif
-}
+inline FILE* FDOpen(int fd, const char* mode) { return fdopen(fd, mode); }
 #endif  // !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_QURT
 inline int FClose(FILE* fp) { return fclose(fp); }
 #if !defined(GTEST_OS_WINDOWS_MOBILE) && !defined(GTEST_OS_QURT)
 inline int Read(int fd, void* buf, unsigned int count) {
-#ifdef GTEST_OS_WINDOWS
-  return static_cast<int>(_read(fd, buf, count));
-#else
   return static_cast<int>(read(fd, buf, count));
-#endif
 }
 inline int Write(int fd, const void* buf, unsigned int count) {
-#ifdef GTEST_OS_WINDOWS
-  return static_cast<int>(_write(fd, buf, count));
-#else
   return static_cast<int>(write(fd, buf, count));
-#endif
-}
-inline int Close(int fd) {
-#ifdef GTEST_OS_WINDOWS
-  return _close(fd);
-#else
-  return close(fd);
-#endif
-}
-inline int Dup(int fd) {
-#ifdef GTEST_OS_WINDOWS
-  return _dup(fd);
-#else
-  return dup(fd);
-#endif
-}
-inline int Dup2(int fd1, int fd2) {
-#ifdef GTEST_OS_WINDOWS
-  return _dup2(fd1, fd2);
-#else
-  return dup2(fd1, fd2);
-#endif
 }
+inline int Close(int fd) { return close(fd); }
 #endif  // !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_QURT
 #endif  // GTEST_HAS_FILE_SYSTEM
 
diff --git a/googletest/src/gtest-port.cc b/googletest/src/gtest-port.cc
index 0023a887..433586f3 100644
--- a/googletest/src/gtest-port.cc
+++ b/googletest/src/gtest-port.cc
@@ -1085,7 +1085,7 @@ bool EndsWithPathSeparator(const std::string& path) {
 class CapturedStream {
  public:
   // The ctor redirects the stream to a temporary file.
-  explicit CapturedStream(int fd) : fd_(fd), uncaptured_fd_(posix::Dup(fd)) {
+  explicit CapturedStream(int fd) : fd_(fd), uncaptured_fd_(dup(fd)) {
 #ifdef GTEST_OS_WINDOWS
     char temp_dir_path[MAX_PATH + 1] = {'\0'};   // NOLINT
     char temp_file_path[MAX_PATH + 1] = {'\0'};  // NOLINT
@@ -1097,7 +1097,7 @@ class CapturedStream {
     GTEST_CHECK_(success != 0)
         << "Failed to create temporary file in " << temp_dir_path
         << " with error " << ::GetLastError();
-    const int captured_fd = _creat(temp_file_path, _S_IREAD | _S_IWRITE);
+    const int captured_fd = creat(temp_file_path, _S_IREAD | _S_IWRITE);
     GTEST_CHECK_(captured_fd != -1)
         << "Failed to open temporary file " << temp_file_path << " with error "
         << ::GetLastError();
@@ -1167,8 +1167,8 @@ class CapturedStream {
     filename_ = std::move(name_template);
 #endif  // GTEST_OS_WINDOWS
     fflush(nullptr);
-    posix::Dup2(captured_fd, fd_);
-    posix::Close(captured_fd);
+    dup2(captured_fd, fd_);
+    close(captured_fd);
   }
 
   ~CapturedStream() { remove(filename_.c_str()); }
@@ -1177,8 +1177,8 @@ class CapturedStream {
     if (uncaptured_fd_ != -1) {
       // Restores the original stream.
       fflush(nullptr);
-      posix::Dup2(uncaptured_fd_, fd_);
-      posix::Close(uncaptured_fd_);
+      dup2(uncaptured_fd_, fd_);
+      close(uncaptured_fd_);
       uncaptured_fd_ = -1;
     }
 
diff --git a/googletest/test/gtest_unittest.cc b/googletest/test/gtest_unittest.cc
index f4d71897..a957c895 100644
--- a/googletest/test/gtest_unittest.cc
+++ b/googletest/test/gtest_unittest.cc
@@ -484,11 +484,9 @@ class FormatEpochTimeInMillisAsIso8601Test : public Test {
     const std::string env_var =
         std::string("TZ=") + (time_zone ? time_zone : "");
     _putenv(env_var.c_str());
-#if defined(GTEST_OS_WINDOWS)
-    _tzset();
-#else
+    GTEST_DISABLE_MSC_WARNINGS_PUSH_(4996 /* deprecated function */)
     tzset();
-#endif
+    GTEST_DISABLE_MSC_WARNINGS_POP_()
 #else
 #if defined(GTEST_OS_LINUX_ANDROID) && __ANDROID_API__ < 21
     // Work around KitKat bug in tzset by setting "UTC" before setting "UTC+00".