I downloaded a fresh set of tar files, xsrc and src directories from 
current (almost all files have a 1/28/06 date).

I executed
    ./build.sh -O ../obj -T ../tools -U -u tools
and I also tried again with a clean slate
    ./build.sh -O ../obj -U -u tools

With both commands, right after success at "create compat/md2hl.d", it 
died with
nbmake: don't know how to make md4c.c Stop

nbmake: stopped in /usr/src/tools/compat

*** Failed target:  dependall-compat
*** Failed command: _makedirtarget() {dir="$........ && 
/usr/src/../obj/tooldir.NetBSD-3.0-i386/bin/nbmake _THISDIR_="${this}" 
"$@" ${target}; }; _makedirtarget compat dependall
*** Error code 2

Stop
nbmake: stopped in /usr/src/tools

ERROR: Failed to make dependall tools
*** BUILD ABORTED ***

Any suggestions???