I just noticed the following complaint during linking.  What does it
mean?  How do I find which of the many files needs the signal.h?
Lastly, this problem may have happened when I change a bunch of
<sys/errno.h>'s to <errno.h> which I believe is now correct.
It's been a long day;  I can not seem to find signals.o in my source
tree or in lib/libc where is it?

c++  norton.o norton-setup.o commands.o norton-volume.o norton-recov.o norton-vnode.o nort\
on-dir.o norton-rds.o dummy.o  ../auth2/libauth2.a  ../rvmres/librvmres.a ../vol/libvol.a \
../volutil/libvolutil.a ../res/libreslib.a ../vv/libvv.a ../rpc2/librpc2.a ../libal/libal.\
a  ../dir/libcodadir.a ../partition/libpartition.a ../util/libutil.a /usr1/rvb/coda/o5/rvm\
-src/rdslwp/librdslwp.a /usr1/rvb/coda/o5/rvm-src/seg/libseg.a                   /usr1/rvb\
/coda/o5/rvm-src/rvmlwp/librvmlwp.a /usr1/rvb/coda/o5/lib-src/mlwp/liboldlwp.a            \
             /usr1/rvb/coda/o5/lib-src/base/libbase.a  /usr/lib/libcompat.a /usr/pkg/lib/l\
ibreadline.a /usr/lib/libtermcap.a -o norton
signals.o: warning: reference to compatibility sigprocmask(); include <signal.h> for corre\
ct reference
signals.o: warning: reference to compatibility sigaction(); include <signal.h> for correct\
 reference
rltty.o: warning: reference to compatibility sigprocmask(); include <signal.h> for correct\
 reference