I see from DM-10587 that the stack should work with tcsh but it doesn't (fully). If you are currently in the LSST_HOME directory when you do source loadLSST.csh then it works fine. But if you are anywhere else source /path/to/loadLSST.csh then it fails to determine LSST_HOME.

The problem is that $0 doesn't work in `tcsh` when a script has been sourced. The following code replacement seems to work in my limited testing:

set called=($_)

set split = ($called:as/ / /)

set LSST_HOME = `dirname $split[2]`

set LSST_HOME = `cd ${LSST_HOME} && pwd`