diff --git a/cmake/HandleGTest.cmake b/cmake/HandleGTest.cmake
new file mode 100644
index 0000000..b9c1443
--- /dev/null
+++ b/cmake/HandleGTest.cmake
@@ -0,0 +1,113 @@
+
+include(split_list)
+
+macro(build_external_gtest)
+  include(ExternalProject)
+  set(GTEST_FLAGS "")
+  if (BENCHMARK_USE_LIBCXX)
+    if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+      list(APPEND GTEST_FLAGS -stdlib=libc++)
+    else()
+      message(WARNING "Unsupported compiler (${CMAKE_CXX_COMPILER}) when using libc++")
+    endif()
+  endif()
+  if (BENCHMARK_BUILD_32_BITS)
+    list(APPEND GTEST_FLAGS -m32)
+  endif()
+  if (NOT "${CMAKE_CXX_FLAGS}" STREQUAL "")
+    list(APPEND GTEST_FLAGS ${CMAKE_CXX_FLAGS})
+  endif()
+  string(TOUPPER "${CMAKE_BUILD_TYPE}" GTEST_BUILD_TYPE)
+  if ("${GTEST_BUILD_TYPE}" STREQUAL "COVERAGE")
+    set(GTEST_BUILD_TYPE "DEBUG")
+  endif()
+  # FIXME: Since 10/Feb/2017 the googletest trunk has had a bug where
+  # -Werror=unused-function fires during the build on OS X. This is a temporary
+  # workaround to keep our travis bots from failing. It should be removed
+  # once gtest is fixed.
+  if (NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
+    list(APPEND GTEST_FLAGS "-Wno-unused-function")
+  endif()
+  split_list(GTEST_FLAGS)
+  set(EXCLUDE_FROM_ALL_OPT "")
+  set(EXCLUDE_FROM_ALL_VALUE "")
+  if (${CMAKE_VERSION} VERSION_GREATER "3.0.99")
+      set(EXCLUDE_FROM_ALL_OPT "EXCLUDE_FROM_ALL")
+      set(EXCLUDE_FROM_ALL_VALUE "ON")
+  endif()
+  ExternalProject_Add(googletest
+      ${EXCLUDE_FROM_ALL_OPT} ${EXCLUDE_FROM_ALL_VALUE}
+      GIT_REPOSITORY https://github.com/google/googletest.git
+      GIT_TAG master
+      PREFIX "${CMAKE_BINARY_DIR}/googletest"
+      INSTALL_DIR "${CMAKE_BINARY_DIR}/googletest"
+      CMAKE_CACHE_ARGS
+        -DCMAKE_BUILD_TYPE:STRING=${GTEST_BUILD_TYPE}
+        -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
+        -DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
+        -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
+        -DCMAKE_INSTALL_LIBDIR:PATH=<INSTALL_DIR>/lib
+        -DCMAKE_CXX_FLAGS:STRING=${GTEST_FLAGS}
+        -Dgtest_force_shared_crt:BOOL=ON
+      )
+
+  ExternalProject_Get_Property(googletest install_dir)
+  set(GTEST_INCLUDE_DIRS ${install_dir}/include)
+  file(MAKE_DIRECTORY ${GTEST_INCLUDE_DIRS})
+
+  set(LIB_SUFFIX "${CMAKE_STATIC_LIBRARY_SUFFIX}")
+  set(LIB_PREFIX "${CMAKE_STATIC_LIBRARY_PREFIX}")
+  if("${GTEST_BUILD_TYPE}" STREQUAL "DEBUG")
+    set(LIB_SUFFIX "d${CMAKE_STATIC_LIBRARY_SUFFIX}")
+  endif()
+
+  # Use gmock_main instead of gtest_main because it initializes gtest as well.
+  # Note: The libraries are listed in reverse order of their dependancies.
+  foreach(LIB gtest gmock gmock_main)
+    add_library(${LIB} UNKNOWN IMPORTED)
+    set_target_properties(${LIB} PROPERTIES
+      IMPORTED_LOCATION ${install_dir}/lib/${LIB_PREFIX}${LIB}${LIB_SUFFIX}
+      INTERFACE_INCLUDE_DIRECTORIES ${GTEST_INCLUDE_DIRS}
+      INTERFACE_LINK_LIBRARIES "${GTEST_BOTH_LIBRARIES}"
+    )
+    add_dependencies(${LIB} googletest)
+    list(APPEND GTEST_BOTH_LIBRARIES ${LIB})
+  endforeach()
+endmacro(build_external_gtest)
+
+if (BENCHMARK_ENABLE_GTEST_TESTS)
+  if (IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/googletest)
+    set(GTEST_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/googletest")
+    set(INSTALL_GTEST OFF CACHE INTERNAL "")
+    set(INSTALL_GMOCK OFF CACHE INTERNAL "")
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/googletest)
+    set(GTEST_BOTH_LIBRARIES gtest gmock gmock_main)
+    foreach(HEADER test mock)
+      # CMake 2.8 and older don't respect INTERFACE_INCLUDE_DIRECTORIES, so we
+      # have to add the paths ourselves.
+      set(HFILE g${HEADER}/g${HEADER}.h)
+      set(HPATH ${GTEST_ROOT}/google${HEADER}/include)
+      find_path(HEADER_PATH_${HEADER} ${HFILE}
+          NO_DEFAULT_PATHS
+          HINTS ${HPATH}
+      )
+      if (NOT HEADER_PATH_${HEADER})
+        message(FATAL_ERROR "Failed to find header ${HFILE} in ${HPATH}")
+      endif()
+      list(APPEND GTEST_INCLUDE_DIRS ${HEADER_PATH_${HEADER}})
+    endforeach()
+  elseif(BENCHMARK_DOWNLOAD_DEPENDENCIES)
+    build_external_gtest()
+  else()
+    find_package(GTest REQUIRED)
+    find_path(GMOCK_INCLUDE_DIRS gmock/gmock.h
+        HINTS ${GTEST_INCLUDE_DIRS})
+    if (NOT GMOCK_INCLUDE_DIRS)
+      message(FATAL_ERROR "Failed to find header gmock/gmock.h with hint ${GTEST_INCLUDE_DIRS}")
+    endif()
+    set(GTEST_INCLUDE_DIRS ${GTEST_INCLUDE_DIRS} ${GMOCK_INCLUDE_DIRS})
+    # FIXME: We don't currently require the gmock library to build the tests,
+    # and it's likely we won't find it, so we don't try. As long as we've
+    # found the gmock/gmock.h header and gtest_main that should be good enough.
+  endif()
+endif()