> Does ./configure detect the compiler correctly as clang? I am
> surprised about the "-fast" error.

Yes it does. In the man page of my clang installation, however, there is no 
mention about a "-fast" option.... And only umfpack compilation complains about 
it. 

> I had errors with the standard library (gnu-something) before, if
> clang was not running in c++ but in c mode. I don't know what apple is
> doing though. Deal.II currently compiles with clang 3.1 on linux.
> 
> Can you compile a hello world c++ app using clang?

Yup. It works just fine. Compilation does not seem a problem. Only linking has 
troubles, and mostly related to assertions and boost...

L
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