2.0 kernel compile fails

[Network Administration]

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