[CentOS] Seeking docbook-to-man package

I'm looking for a source RPM for docbook-to-man.

I'm trying to build/install pxlib:

<http://pxlib.sourceforge.net/installation.php>

The tarball is set up to create an RPM, but it fails to convert its SGML 
documentation to man pages because I'm missing docbook-to-man. I found the 
latter here:

<http://www.oasis-open.org/docbook/tools/dtm/>

I'm hoping someone has packaged this and has a source RPM available.