Index: cmake/Modules/AddCompilerRT.cmake
===================================================================
--- cmake/Modules/AddCompilerRT.cmake
+++ cmake/Modules/AddCompilerRT.cmake
@@ -113,6 +113,13 @@
   -I${COMPILER_RT_GTEST_PATH}
 )
 
+# System headers incorrectly define 'size_t' as 'unsigned long' on
+# x86_64 FreeBSD 9.2 in 32-bit mode whereas 'unsigned int' is expected.
+if(CMAKE_SYSTEM MATCHES "FreeBSD-9.2-RELEASE" AND
+    CMAKE_SIZEOF_VOID_P EQUAL 8)
+  list(APPEND COMPILER_RT_GTEST_CFLAGS -D_SIZE_T_DECLARED)
+endif()
+
 # Link objects into a single executable with COMPILER_RT_TEST_COMPILER,
 # using specified link flags. Make executable a part of provided
 # test_suite.