diff --git a/CHANGES b/CHANGES
index f703ac2e..16fc85d8 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,27 @@
+Changes for 1.5.0:
+
+ * Support for use in multi-threaded tests on platforms having pthreads
+   (by virtue of the Google Test thread change)
+ * The new matcher API lets user-defined matchers generate custom
+   explanations more directly and efficiently.
+ * Better expectation failure messages.
+ * NotNull() and IsNull() now work with smart pointers.
+ * Field() and Property() now work when the matcher argument is a pointer
+   passed by reference.
+ * Regular expression matching on all platforms.
+ * Added GCC 4.0 support for Google Mock Doctor.
+ * Added gmock_all_test.cc for compiling most Google Mock tests
+   in a single file.
+ * Significantly cleaned up compiler warnings.
+ * Bug fixes, better test coverage, and implementation clean-ups.
+
+ Potentially breaking changes:
+
+ * Custom matchers defined using MatcherInterface or MakePolymorphicMatcher()
+   need to be updated after upgrading to Google Mock 1.5.0; matchers defined
+   using MATCHER or MATCHER_P* aren't affected.
+ * Dropped support for 'make install'.
+
 Changes for 1.4.0 (we skipped 1.2.* and 1.3.* to match the version of
 Google Test):
 
diff --git a/Makefile.am b/Makefile.am
index c10d81cd..30941d4f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,5 @@
+# Automake file
+
 # Nonstandard package files for distribution.
 EXTRA_DIST =
 
@@ -16,6 +18,12 @@ DISTCLEANFILES = scripts/gmock-config
 # directories.
 AM_CPPFLAGS = $(GTEST_CPPFLAGS) -I$(srcdir)/include
 
+# Modifies compiler and linker flags for pthreads compatibility.
+if HAVE_PTHREADS
+  AM_CXXFLAGS = @PTHREAD_CFLAGS@ -DGTEST_HAS_PTHREAD=1
+  AM_LIBS = @PTHREAD_LIBS@
+endif
+
 # Build rules for libraries.
 lib_LTLIBRARIES = lib/libgmock.la lib/libgmock_main.la
 
diff --git a/configure.ac b/configure.ac
index 25ab6f36..8498a6c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,7 @@
+m4_include(gtest/m4/acx_pthread.m4)
+
 AC_INIT([Google C++ Mocking Framework],
-        [1.4.0],
+        [1.5.0],
         [googlemock@googlegroups.com],
         [gmock])
 
@@ -35,6 +37,25 @@ AM_CONDITIONAL([HAVE_PYTHON],[test "$PYTHON" != ":"])
 
 # TODO(chandlerc@google.com) Check for the necessary system headers.
 
+# Configure pthreads.
+AC_ARG_WITH([pthreads],
+            [AS_HELP_STRING([--with-pthreads],
+               [use pthreads (default is yes)])],
+            [with_pthreads=$withval],
+            [with_pthreads=check])
+
+have_pthreads=no
+AS_IF([test "x$with_pthreads" != "xno"],
+      [ACX_PTHREAD(
+        [],
+        [AS_IF([test "x$with_pthreads" != "xcheck"],
+               [AC_MSG_FAILURE(
+                 [--with-pthreads was specified, but unable to be used])])])
+       have_pthreads="$acx_pthread_ok"])
+AM_CONDITIONAL([HAVE_PTHREADS],[test "x$have_pthreads" == "xyes"])
+AC_SUBST(PTHREAD_CFLAGS)
+AC_SUBST(PTHREAD_LIBS)
+
 # GoogleMock currently has hard dependencies upon GoogleTest above and beyond
 # running its own test suite, so we both provide our own version in
 # a subdirectory and provide some logic to use a custom version or a system
@@ -80,7 +101,7 @@ AC_ARG_VAR([GTEST_VERSION],
            [The version of Google Test available.])
 HAVE_BUILT_GTEST="no"
 
-GTEST_MIN_VERSION="1.4.0"
+GTEST_MIN_VERSION="1.5.0"
 
 AS_IF([test "x${enable_external_gtest}" = "xyes"],
       [# Begin filling in variables as we are able.
diff --git a/include/gmock/gmock-spec-builders.h b/include/gmock/gmock-spec-builders.h
index d8d4749a..9b60f692 100644
--- a/include/gmock/gmock-spec-builders.h
+++ b/include/gmock/gmock-spec-builders.h
@@ -112,7 +112,7 @@ template <typename F> class FunctionMockerBase;
 // expectations when InSequence() is used, and thus affect which
 // expectation gets picked.  Therefore, we sequence all mock function
 // calls to ensure the integrity of the mock objects' states.
-extern Mutex g_gmock_mutex;
+GTEST_DECLARE_STATIC_MUTEX_(g_gmock_mutex);
 
 // Abstract base class of FunctionMockerBase.  This is the
 // type-agnostic part of the function mocker interface.  Its pure
diff --git a/src/gmock-internal-utils.cc b/src/gmock-internal-utils.cc
index 4c51ec00..cc51836b 100644
--- a/src/gmock-internal-utils.cc
+++ b/src/gmock-internal-utils.cc
@@ -103,7 +103,7 @@ FailureReporterInterface* GetFailureReporter() {
 }
 
 // Protects global resources (stdout in particular) used by Log().
-static Mutex g_log_mutex(Mutex::NO_CONSTRUCTOR_NEEDED_FOR_STATIC_MUTEX);
+static GTEST_DEFINE_STATIC_MUTEX_(g_log_mutex);
 
 // Returns true iff a log with the given severity is visible according
 // to the --gmock_verbose flag.
diff --git a/src/gmock-spec-builders.cc b/src/gmock-spec-builders.cc
index 02a3227f..dab1a2c9 100644
--- a/src/gmock-spec-builders.cc
+++ b/src/gmock-spec-builders.cc
@@ -53,7 +53,7 @@ namespace internal {
 
 // Protects the mock object registry (in class Mock), all function
 // mockers, and all expectations.
-Mutex g_gmock_mutex(Mutex::NO_CONSTRUCTOR_NEEDED_FOR_STATIC_MUTEX);
+GTEST_DEFINE_STATIC_MUTEX_(g_gmock_mutex);
 
 // Constructs an ExpectationBase object.
 ExpectationBase::ExpectationBase(const char* a_file,