docdir variable is overwritten in extras/Makefile.am extras/benchmarking/Makefile.am As result package maintainers have no control over the destination directory for a few doc files.
The proposed patch (http://review.gluster.com/3971) failed building. Please check http://build.gluster.com/job/glusterfs/4519/console for details. Could you propose an updated patch that passes the build-test? Thanks!
CHANGE: http://review.gluster.org/3971 (Respect autotools docdir variable) merged in master by Anand Avati (avati)