environment variable

 Hi,

 in our documents we have often something like:

 \usepackage{$HOME/path...}

 or

 \input{$HOME/path...}

 with tetex-1.0 it's working perfectly, but now we installed tetex-3.0 on one
workstation and latex doesn't know about $HOME (UNIX environment variable for a
home directory).

 We have a large system here (300 users / 250 workstations) that automatically
creates reports, technical-documents,  etc. in latex.  We would prefer not to
change things and anyway cannot change all of this in a short time.

 Must we stay on tetex-1.0 or is there a possibility to teach tetex-3.0 to know
environment-variables under UNIX?

 thx

 Olli