INSTALLATION_DIRS, as well as all occurrences of ${PREFIX}/man with
${PREFIX}/${PKGMANDIR}.
Fixes PR 35265, although I did not use the patch provided therein.
Zidrav is a file corruption detection and repair program. It is
designed to provide a way to fix file damage without having to
redownload the entire (potentially large) file over a (potentially
slow) connection. A checksum file is generated for the broken file.
The checksum file can then be used together with the correct file to
produce a binary patch file for repair.
