build c-sdk on FreeBSD-7.2

Dear all,

I try to build Fedora Directory Server on FreeBSD -7.2. Now I am
building `mozldap` . The `ld` prorgram fails with option `-pthread`:

<pre>
# ./configure --enable-clu --with-sasl=/usr/local --with-svrcore=/usr/
local

....
checking whether gcc accepts -pthread... yes
creating ./config.status
.....

# gmake
/usr/bin/ld: unrecognized option '-pthread'
/usr/bin/ld: use the --help option for usage information
gmake[3]: *** [libprldap60.so] Error 1
</pre>

How can I get rid of this error?

Thank you for your helps.

Regards.