Fix configure check.
--- cmake/FindGoogleHash.cmake.orig	Tue Jul 30 15:24:36 2013
+++ cmake/FindGoogleHash.cmake	Tue Jul 30 15:24:20 2013
@@ -1,4 +1,7 @@
 
+include(CMakePushCheckState)
+include(CheckCXXSourceCompiles)
+
 if (GOOGLEHASH_INCLUDES AND GOOGLEHASH_LIBRARIES)
   set(GOOGLEHASH_FIND_QUIETLY TRUE)
 endif (GOOGLEHASH_INCLUDES AND GOOGLEHASH_LIBRARIES)
@@ -9,12 +12,16 @@ find_path(GOOGLEHASH_INCLUDES
   PATHS
   ${INCLUDE_INSTALL_DIR}
 )
+message(STATUS "GOOGLEHASH_INCLUDES: ${GOOGLEHASH_INCLUDES}")
 
 if(GOOGLEHASH_INCLUDES)
-  # let's make sure it compiles with the current compiler
-  file(WRITE ${CMAKE_BINARY_DIR}/googlehash_test.cpp
-  "#include <google/sparse_hash_map>\n#include <google/dense_hash_map>\nint main(int argc, char** argv) { google::dense_hash_map<int,float> a; google::sparse_hash_map<int,float> b; return 0;}\n")
-  try_compile(GOOGLEHASH_COMPILE ${CMAKE_BINARY_DIR} ${CMAKE_BINARY_DIR}/googlehash_test.cpp OUTPUT_VARIABLE GOOGLEHASH_COMPILE_RESULT)
+  cmake_push_check_state()
+  set(CMAKE_REQUIRED_FLAGS)
+  set(CMAKE_REQUIRED_DEFINITIONS)
+  set(CMAKE_REQUIRED_INCLUDES ${GOOGLEHASH_INCLUDES})
+  set(CMAKE_REQUIRED_LIBRARIES)
+  check_cxx_source_compiles("#include <google/sparse_hash_map>\n#include <google/dense_hash_map>\nint main(int argc, char** argv) { google::dense_hash_map<int,float> a; google::sparse_hash_map<int,float> b; return 0;}\n" GOOGLEHASH_COMPILE)
+  cmake_pop_check_state()
 endif(GOOGLEHASH_INCLUDES)
 
 include(FindPackageHandleStandardArgs)