diff --git a/aos/externals/gtest.patch b/aos/externals/gtest.patch
new file mode 100644
index 0000000..6caba01
--- /dev/null
+++ b/aos/externals/gtest.patch
@@ -0,0 +1,63 @@
+diff -rupN gtest-1.6.0-p1/fused-src/gtest/gtest-all.cc gtest-1.6.0/fused-src/gtest/gtest-all.cc
+--- gtest-1.6.0-p1/fused-src/gtest/gtest-all.cc	2011-04-15 12:54:57.000000000 -0700
++++ gtest-1.6.0/fused-src/gtest/gtest-all.cc	2012-11-12 17:42:37.881573135 -0800
+@@ -379,7 +379,25 @@ class GTEST_API_ SingleFailureChecker {
+ 
+ // cpplint thinks that the header is already included, so we want to
+ // silence it.
++#ifdef __VXWORKS__
++# include <time.h>  // NOLINT
++# include <sys/times.h>  // NOLINT
++static inline int gettimeofday(struct timeval *tv, void *) {
++  struct timespec ts;
++
++  if (clock_gettime(CLOCK_REALTIME, &ts) != 0) {
++    printf("Gettimeofday error\n");
++    tv->tv_sec = 0;
++    tv->tv_usec = 0;
++    return -1;
++  }
++  tv->tv_sec  = ts.tv_sec;
++  tv->tv_usec = ts.tv_nsec/1000;
++  return 0;
++}
++#else
+ # include <sys/time.h>  // NOLINT
++#endif
+ # include <unistd.h>  // NOLINT
+ 
+ #endif  // GTEST_OS_LINUX
+@@ -7751,6 +7769,8 @@ bool FilePath::CreateFolder() const {
+   delete [] unicode;
+ #elif GTEST_OS_WINDOWS
+   int result = _mkdir(pathname_.c_str());
++#elif defined(__VXWORKS__)
++  int result = mkdir(pathname_.c_str());
+ #else
+   int result = mkdir(pathname_.c_str(), 0777);
+ #endif  // GTEST_OS_WINDOWS_MOBILE
+@@ -7870,7 +7890,7 @@ void FilePath::Normalize() {
+ namespace testing {
+ namespace internal {
+ 
+-#if defined(_MSC_VER) || defined(__BORLANDC__)
++#if defined(_MSC_VER) || defined(__BORLANDC__) || defined(__VXWORKS__)
+ // MSVC and C++Builder do not provide a definition of STDERR_FILENO.
+ const int kStdOutFileno = 1;
+ const int kStdErrFileno = 2;
+diff -rupN gtest-1.6.0-p1/include/gtest/internal/gtest-port.h gtest-1.6.0/include/gtest/internal/gtest-port.h
+--- gtest-1.6.0-p1/include/gtest/internal/gtest-port.h	2011-04-15 12:49:10.000000000 -0700
++++ gtest-1.6.0/include/gtest/internal/gtest-port.h	2012-11-12 17:27:33.536801263 -0800
+@@ -197,6 +197,12 @@
+ #include <sstream>  // NOLINT
+ #include <string>  // NOLINT
+ 
++#ifdef __VXWORKS__
++int read(int fd, void *buf, size_t count);
++int write(int fd, const void *buf, size_t count);
++int close(int fd);
++#endif
++
+ #define GTEST_DEV_EMAIL_ "googletestframework@@googlegroups.com"
+ #define GTEST_FLAG_PREFIX_ "gtest_"
+ #define GTEST_FLAG_PREFIX_DASH_ "gtest-"