some envvar are not documented, put them in com...
some envvar are not documented, put them in com...

some envvar are not documented, put them in comments so that I don't recheck them again later

This commit was SVN r3600.

ggouaillardet/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc