rm -f Makefile
cp Makefile.dst Makefile
chmod u+w Makefile
ed - Makefile  <<'EOF'
g/^#V7 /s///
g/^#USG /d
g/^#VMS /d
g/^#BSD4_[123] /d
g/#NOTVMS/s/#NOTVMS.*//
w
q
EOF
rm -f defs.h
cp defs.dist defs.h
chmod u+w defs.h
# ed - defs.h <<'EOF'
# w
# q
# EOF