FreeBSD Porter's Handbook
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# 12.11 Threading Libraries

The threading library must be linked to the binaries using a special flag `-pthread` on FreeBSD. If a port insists on linking `-lpthread` directly, patch it to use `-pthread`.

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

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