clang vs llvm-gcc-4.2 with py27-matplotlib

[Jeremy Lavergne]

> In #31046 [1] py27-matplotlib is failing to build with Xcode-4.2, the
> compiler being used is clang. When I try to reproduce this on my Lion
> system with Xcode-4.2 I can't, my system builds the port using
> llvm-gcc-4.2. Does anyone have any idea why one system would use clang
> and another llvm-gcc-4.2? Is there some configuration option that
> would control this?

It isn't presently a configuration you can change, however you can presently specify it when you run a port command:
`port install py27-matplotlib configure.compiler=clang`

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