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: no-keepalive
Help: Disable TCP keepalive on the connection
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Disables the use of keepalive messages on the TCP connection. curl otherwise
enables them by default.

Note that this is the negated option name documented. You can thus use
--keepalive to enforce keepalive.