Applied fixes suggested by @fxha. This commit addresses #4

CMakeLists.txt

@@ -375,7 +375,7 @@ list(REMOVE_ITEM cryptopp_HEADERS
 		)
 
 # Test sources. You can use the GNUmakefile to generate the list: `make sources`.
-file(GLOB cryptopp_SOURCES_TEST test.cpp bench1.cpp bench2.cpp validat0.cpp validat1.cpp validat2.cpp validat3.cpp adhoc.cpp datatest.cpp regtest1.cpp regtest2.cpp regtest3.cpp fipsalgt.cpp dlltest.cpp fipstest.cpp)
+file(GLOB cryptopp_SOURCES_TEST test.cpp bench1.cpp bench2.cpp validat0.cpp validat1.cpp validat2.cpp validat3.cpp validat4.cpp adhoc.cpp datatest.cpp regtest1.cpp regtest2.cpp regtest3.cpp fipsalgt.cpp dlltest.cpp fipstest.cpp)
 
 # Library sources. You can use the GNUmakefile to generate the list: `make sources`.
 # Makefile sorted them at http://github.com/weidai11/cryptopp/pull/426.
@@ -429,7 +429,7 @@ endif ()
 # TODO: Android, AIX, IBM xlC, iOS and a few other profiles are missing.
 
 # New as of Pull Request 461, http://github.com/weidai11/cryptopp/pull/461.
-if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
 
 	if (CRYPTOPP_AMD64 OR CRYPTOPP_I386 OR CRYPTOPP_X32)