Fixes tr1 tuple's path when compiled with gcc version < 4.0.0 (by Zhanyong Wan).

include/gmock/internal/gmock-port.h

@@ -48,12 +48,14 @@
 // To avoid conditional compilation everywhere, we make it
 // gmock-port.h's responsibility to #include the header implementing
 // tr1/tuple.
-#if defined(__GNUC__)
-// GCC implements tr1/tuple in the <tr1/tuple> header.  This does not
-// conform to the TR1 spec, which requires the header to be <tuple>.
+#if defined(__GNUC__) && GTEST_GCC_VER_ >= 40000
+// GTEST_GCC_VER_ is defined in gtest-port.h and 40000 corresponds to
+// version 4.0.0.
+// GCC 4.0+ implements tr1/tuple in the <tr1/tuple> header.  This does
+// not conform to the TR1 spec, which requires the header to be <tuple>.
 #include <tr1/tuple>
 #else
-// If the compiler is not GCC, we assume the user is using a
+// If the compiler is not GCC 4.0+, we assume the user is using a
 // spec-conforming TR1 implementation.
 #include <tuple>
 #endif  // __GNUC__