pthreads in guid.c break compile

[Matthew Vanecek]

When compiling the cvs head, I get the following errors:

../.libs/libgncmod-engine.so: undefined reference to
`pthread_getspecific'
../.libs/libgncmod-engine.so: undefined reference to `pthread_once'
../.libs/libgncmod-engine.so: undefined reference to
`pthread_key_create'
../.libs/libgncmod-engine.so: undefined reference to
`pthread_setspecific'


Should there be another library included in the link step to pick up
these functions?

-- 
Matthew Vanecek
perl -e 'print $i=pack(c5,(41*2),sqrt(7056),(unpack(c,H)-2),oct(115),10);'
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I'm always getting in the way of something...