Allow to build with the PyPI package "clang" instead of "libclang". 1. It seems to be maintained. 2. In the FreeBSD base system there is no pre-built libclang.so. If you need this library you have to install llvm from ports additionally. 2. On FreeBSD there is no pre-built wheel "libclang" with a packaged libclang.so.

Long: stderr
Help: Where to redirect stderr
See-also: verbose silent
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Redirect all writes to stderr to the specified file instead. If the file name
is a plain '-', it is instead written to stdout.

If this option is used several times, the last one will be used.