Bug 97933

Here a fragment of "make" outpu:

cc -DDBUG_OFF -O -pipe -mcpu=pentiumpro -D_THREAD_SAFE -o .libs/myisamchk myisamchk.o  libmyisam.a .
./mysys/libmysys.a ../dbug/libdbug.a ../strings/libmystrings.a ../zlib/.libs/libz.so -lcrypt -lm -Wl
,--rpath -Wl,/usr/local/lib/mysql
libmyisam.a(mi_check.o): In function `mi_repair_parallel':
mi_check.o(.text+0x75de): undefined reference to `pthread_attr_init'
mi_check.o(.text+0x75f4): undefined reference to `pthread_attr_setdetachstate'
mi_check.o(.text+0x768e): undefined reference to `pthread_create'
mi_check.o(.text+0x76e5): undefined reference to `pthread_attr_destroy'
./mysys/libmysys.a(thr_lock.o): In function `wait_for_lock':
thr_lock.o(.text+0x21b): undefined reference to `pthread_cond_timedwait'
./mysys/libmysys.a(thr_lock.o): In function `thr_abort_locks_for_thread':
thr_lock.o(.text+0xc1e): undefined reference to `pthread_equal'
thr_lock.o(.text+0xc8e): undefined reference to `pthread_equal'

How-To-Repeat: Run a command:
cd /usr/ports/databases/mysql50-server && make