Notice that /uar/share/man/man1/db2dvi.1.gz is a symlink to jw.1.gz, however no man page is found. JBJ tells me that due to .so diversions all links must be relative to /usr/share/man.
No, what this is is that I forgot to put '.1' in the symlink names. Rats. I will have time to fix it tomorrow I hope (but right now I have to catch a train..).
Fixed in ~twaugh/docbook-utils-0.6-13.src.rpm.