i've been successively updating, watching a build fail, updating,
watching a build fail, updating, etc. for about a week now.  maybe
it's me, but the last few times the build died with either of:

dependall ===> gnu/usr.sbin/sendmail/doc/op
/usr/src/tools/tools.NetBSD-1.5Y-sparc/bin/nbgroff -Tps -me  /usr/src/gnu/usr.sbin/sendmail/doc/op/../../../../dist/sendmail/doc/op/op.me > paper.ps
Segmentation fault - core dumped
*** Error code 139

or:

building llib-lc.ln
Lint pass2:
/usr/src/tools/tools.NetBSD-1.5Y-sparc/bin/nbgroff -Tascii -mtty-char -mandoc /usr/src/lib/libc/db/man/btree.3  > btree.cat3
Segmentation fault - core dumped
*** Error code 139

depending on whether or not i have MKMAN set to "no" or not.  the
regular groff from my last successful build (about six weeks ago)
still works.

# ldd /usr/bin/groff /usr/src/tools/tools.NetBSD-1.5Y-sparc/bin/nbgroff
/usr/bin/groff:
         -lm.0 => /usr/lib/libm.so.0
         -lc.12 => /usr/lib/libc.so.12
/usr/src/tools/tools.NetBSD-1.5Y-sparc/bin/nbgroff:
         -lstdc++.4 => /usr/lib/libstdc++.so.4
         -lm.0 => /usr/lib/libm.so.0
         -lc.12 => /usr/lib/libc.so.12

# ls -l /usr/lib/libstdc++.so.4* /usr/lib/libm.so.0* /usr/lib/libc.so.12*
lrwxr-xr-x  1 root  wheel      13 Nov 18 09:30 /usr/lib/libc.so.12@ -> libc.so.12.80
-r--r--r--  1 root  wheel  779454 Sep 28 08:44 /usr/lib/libc.so.12.78
-r--r--r--  1 root  wheel  783716 Oct  7 13:37 /usr/lib/libc.so.12.79
-r--r--r--  1 root  wheel  782257 Nov 18 09:30 /usr/lib/libc.so.12.80
lrwxr-xr-x  1 root  wheel      11 Nov 18 09:31 /usr/lib/libm.so.0@ -> libm.so.0.1
-r--r--r--  1 root  wheel  166687 Nov 18 09:31 /usr/lib/libm.so.0.1
lrwxr-xr-x  1 root  wheel      16 Nov 18 10:30 /usr/lib/libstdc++.so.4@ -> libstdc++.so.4.0
-r--r--r--  1 root  wheel  345452 Nov 18 10:30 /usr/lib/libstdc++.so.4.0

anyone have any ideas?

-- 
|-----< "CODE WARRIOR" >-----|
codewarrior@daemon.org             * "ah!  i see you have the internet
twofsonet@graffiti.com (Andrew Brown)                that goes *ping*!"
andrew@crossbar.com       * "information is power -- share the wealth."