The clang compiler mimics gcc 4.2.1 for the most part, but curl's configure gets a little confused about what features it supports, since it currently thinks clang is gcc 1.0. This patch lets configure understand the proper options clang supports, which are essentially the same as gcc 4.2.1.

I've also included the corresponding patch for cares, since it's basically the same. Let me know if you want it submitted separately to the cares list.

Daniel

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