On an older, originally Slackware, kernel 2.0 system, I get configure --disable-client make ... make[2]: Leaving directory `/usr/src/routing/bird-1.0.0/obj/proto/static' gcc -o ../bird nest/all.o filter/all.o proto/bgp/all.o proto/ospf/all.o proto/pipe/all.o proto/rip/all.o proto/static/all.o conf/all.o lib/birdlib.a lib/birdlib.a(io.o): In function `sk_open_unix': /usr/src/routing/bird-1.0.0/obj/lib/io.c:777: undefined reference to `SUN_LEN' make[1]: *** [../bird] Error 1 make[1]: Leaving directory `/usr/src/routing/bird-1.0.0/obj' make: *** [all] Error 2 What is missing here? Thanks for releasing bird, I still haven't determined the 'correct way of thinking' to get gated running smoothly. I like the connection to the advanced routing features in 2.4 kernels too. r