When building with -DWITH_WSREP=OFF -DPLUGIN_WSREP_INFO=NO, I am still finding many wsrep-related files installed in the INSTALLDIR. Specifically:
Whether or not the includes files should be installed I don't know, and the SQL in wsrep_notify and the README-wsrep could also be argued. But, certainly the man pages should not be installed as the tools are not built or installed.
I would suggest that none of these should be installed, and that the build configurtion should turn them all off if -DWITH_WSREP=OFF.