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.
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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