diff --git a/base/command_line.cc b/base/command_line.cc
index 2e6021dc2ca863..3308e80d7501a6 100644
--- a/base/command_line.cc
+++ b/base/command_line.cc
@@ -224,7 +224,7 @@ void CommandLine::Init(int argc, const char* const* argv) {
 #endif
 }
 
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
+#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_NACL)
 // static
 void CommandLine::SetProcTitle() {
   // Build a single string which consists of all the arguments separated
diff --git a/base/logging.cc b/base/logging.cc
index 2658519d89917b..74f9a87ffc97b5 100644
--- a/base/logging.cc
+++ b/base/logging.cc
@@ -19,7 +19,12 @@ typedef HANDLE MutexHandle;
 #include <mach/mach_time.h>
 #include <mach-o/dyld.h>
 #elif defined(OS_POSIX)
+#if defined(OS_NACL)
+#include <sys/nacl_syscalls.h>
+#include <sys/time.h> // timespec doesn't seem to be in <time.h>
+#else
 #include <sys/syscall.h>
+#endif
 #include <time.h>
 #endif
 
@@ -128,6 +133,8 @@ int32 CurrentThreadId() {
 #elif defined(OS_FREEBSD)
   // TODO(BSD): find a better thread ID
   return reinterpret_cast<int64>(pthread_self());
+#elif defined(OS_NACL)
+  return pthread_self();
 #endif
 }
 
@@ -136,6 +143,10 @@ uint64 TickCount() {
   return GetTickCount();
 #elif defined(OS_MACOSX)
   return mach_absolute_time();
+#elif defined(OS_NACL)
+  // NaCl sadly does not have _POSIX_TIMERS enabled in sys/features.h
+  // So we have to use clock() for now.
+  return clock();
 #elif defined(OS_POSIX)
   struct timespec ts;
   clock_gettime(CLOCK_MONOTONIC, &ts);
diff --git a/build/build_config.h b/build/build_config.h
index e2d26cbad97b80..3218a05560fc4a 100644
--- a/build/build_config.h
+++ b/build/build_config.h
@@ -17,6 +17,8 @@
 // A set of macros to use for platform detection.
 #if defined(__APPLE__)
 #define OS_MACOSX 1
+#elif defined(__native_client__)
+#define OS_NACL 1
 #elif defined(__linux__)
 #define OS_LINUX 1
 // Use TOOLKIT_GTK on linux if TOOLKIT_VIEWS isn't defined.
@@ -60,7 +62,7 @@
 // For access to standard POSIXish features, use OS_POSIX instead of a
 // more specific macro.
 #if defined(OS_MACOSX) || defined(OS_LINUX) || defined(OS_FREEBSD) || \
-    defined(OS_OPENBSD) || defined(OS_SOLARIS)
+    defined(OS_OPENBSD) || defined(OS_SOLARIS) || defined(OS_NACL)
 #define OS_POSIX 1
 // Use base::DataPack for name/value pairs.
 #define USE_BASE_DATA_PACK 1