/var/vpopmail/doc looks like it was symlinked to /usr/share/doc/5.2.1-r4 by the install. should be /usr/share/doc/vpopmail-5.2.1-r4
dosym /usr/share/doc/${PVR}/ ${VPOP_HOME}/doc This is the symlink created in 5.2.1-r5 which appears to be correct.