Hi,

with the newest version of clang on Mac OSX the clang version isn't detected. The reason is that the version string changed and the used regular expression doesn't work any longer. The issue can easily be solved by slightly changing the used regex. Please find a patch below.

Ciao

Florian 

--- cmake/Modules/Geant4MakeRules_cxx.cmake_orig	2015-04-11 00:48:37.000000000 -0700
+++ cmake/Modules/Geant4MakeRules_cxx.cmake	2015-04-11 00:49:25.000000000 -0700
@@ -80,7 +80,7 @@
   # and if so extract the original LLVM version which should appear as
   # "based on LLVM X.Ysvn"
   if(APPLE AND "${_clangcxx_version}" MATCHES ".*Apple LLVM version.*")
-    string(REGEX REPLACE ".*based on LLVM ([0-9]\\.[0-9]+)svn.*" "\\1" _clangcxx_version ${_clangcxx_version})
+    string(REGEX REPLACE ".*based on LLVM ([0-9][.0-9]+)svn.*" "\\1" _clangcxx_version ${_clangcxx_version})
   endif()
   message(STATUS "Clang version : ${_clangcxx_version}")