Replaced ENV.gcc_4_2 + comments with calls to "fails_with_llvm",
to specifically message to the user when a formula is known or suspected
to not build with LLVM. If the user specifies "--use-llvm", the message
will be displayed, but compilation will be tried anyway.
Since using LLVM is now an advanced/hidden feature instead of the
default on 10.6, we'll let the user try anyway (and submit patches
if things are now working.)
Gwenhywfar allows porting of your software to different operating systems like
Linux, *BSD, Windows etc. It also provides you with some often needed modules
such as configuration file handling, simple XML file parsing, IPC etc.
