There are lots of missing man pages:

W: sdf: link-to-undocumented-manpage usr/share/man/man1/fm2ps.1.gz
W: sdf: link-to-undocumented-manpage usr/share/man/man1/mif2rtf.1.gz
W: sdf: link-to-undocumented-manpage usr/share/man/man1/poddiff.1.gz
W: sdf: link-to-undocumented-manpage usr/share/man/man1/prn2ps.1.gz
W: sdf: link-to-undocumented-manpage usr/share/man/man1/sdf.1.gz
W: sdf: link-to-undocumented-manpage usr/share/man/man1/sdfapi.1.gz
W: sdf: link-to-undocumented-manpage usr/share/man/man1/sdfbatch.1.gz
W: sdf: link-to-undocumented-manpage usr/share/man/man1/sdfcli.1.gz
W: sdf: link-to-undocumented-manpage usr/share/man/man1/sdfget.1.gz
W: sdf: link-to-undocumented-manpage usr/share/man/man1/sdngen.1.gz

Fixing this properly requires hacking sdf to generate real man pages in
the conventional style rather than files which happen to be valid input
to 'groff -man'. I have some code which may achieve this well enough for
this purpose.