vlk wrote:
> http://www.solinno.co.uk/md5sig/quagga_linux-2.6.20_md5sig.diff
> patch is ok,  but compile no. Do you know any solution for this problem?

This [1] is a working patch for net/quagga-devel in pkgsrc. cd there and `make 
patch`. After that cd work/quagga-0.99.4/bgpd && patch < quagga.patch && 
cd ../../.. && make install

It's compiling but not working as expected and, Jeff said this also, something 
is broken in TCP_SIGNATURE kernel code.

[1] http://kefren.netbsd.ro/quagga.patch

Good luck,
-- 
Mihai