procmail-3.11pre5 vs solaris

This new version doesn't work.

Running LAA24037 (sequence 4 of 4)
"|IFS=' '&&exec /usr/sbin/procmail -f-||exit 75 #helm"... Connecting to prog...
mailer prog died with signal 13

(This is SIGPIPE -- if that's truly the problem).

ssh:fionn% uname -a
SunOS fionn 5.5.1 Generic_103640-06 sun4u

ssh:fionn% cc -V
cc: SC4.0 18 Oct 1995 C 4.0

Compiled with -xO4.

pre4 works fine, compiled the same way on same architecture.