FreeBSD Porter's Handbook
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# 12.12. Threading libraries

The threading library must be linked to the binaries using a special linker flag `-pthread` on FreeBSD. If a port insists on linking `-lpthread` or `-lc_r` directly, patch it to use `PTHREAD_LIBS` variable provided by the ports framework. This variable usually has the value of `-pthread`, but on certain architectures and FreeBSD versions it can have different values, so do not just hardcode `-pthread` into patches and always use `PTHREAD_LIBS`.

> 注: If building the port errors out with `unrecognized option '-pthread'` when setting `PTHREAD_LIBS`, it may be desirable to use `gcc` as linker by setting `CONFIGURE_ENV` to `LD=${CC}`. The `-pthread` option is not supported by `ld` directly.

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