I've seen this since last week:

dependall ===> regress/lib/libc/siginfo/sigalrm
CC=/src/obj//tooldir.NetBSD-1.6ZB-alpha/bin/alpha--netbsd-gcc /src/obj//tooldir.
NetBSD-1.6ZB-alpha/bin/nbmkdep -f sigalrm.d     -nostdinc -isystem /src/destdir/
/usr/include    /src/src/regress/lib/libc/siginfo/sigalrm/sigalrm.c
cat sigalrm.d /dev/null > .depend
rm -f .gdbinit
echo "set solib-absolute-prefix /src/destdir/" > .gdbinit
/src/obj//tooldir.NetBSD-1.6ZB-alpha/bin/alpha--netbsd-gcc -O2 -pipe -pipe   -We
rror -mieee    -nostdinc -isystem /src/destdir//usr/include  -c    /src/src/regr
ess/lib/libc/siginfo/sigalrm/sigalrm.c
/src/src/regress/lib/libc/siginfo/sigalrm/sigalrm.c: In function `main':
/src/src/regress/lib/libc/siginfo/sigalrm/sigalrm.c:46: error: `SA_SIGINFO' unde
clared (first use in this function)
/src/src/regress/lib/libc/siginfo/sigalrm/sigalrm.c:46: error: (Each undeclared 
identifier is reported only once
/src/src/regress/lib/libc/siginfo/sigalrm/sigalrm.c:46: error: for each function
 it appears in.)

 *** Failed target:  sigalrm.o
 *** Failed command: /src/obj//tooldir.NetBSD-1.6ZB-alpha/bin/alpha--netbsd-gcc -
 O2 -pipe -pipe -Werror -mieee -nostdinc -isystem /src/destdir//usr/include -c /s
 rc/src/regress/lib/libc/siginfo/sigalrm/sigalrm.c
 *** Error code 1

 Stop.
 nbmake: stopped in /src/src/regress/lib/libc/siginfo/sigalrm

 *** Failed target:  dependall
 *** Failed command: cd /src/src/regress/lib/libc/siginfo/sigalrm; /src/obj//tool
 dir.NetBSD-1.6ZB-alpha/bin/nbmake realall
 *** Error code 1


(formatting might be whacky, sorry). Sources updated today, built with:

./build.sh -D /src/destdir -O /src/obj distribution

/etc/mk.conf has COPTS+=-pipe and CFLAGS+=pipe.

Thanks in advance,
-- 
jht