Hey guys im trying to install preenv to play webOS games on my nokia n900 v21.2011.38-1.203.1 RX-51 but i'm not being able to. i type the command "apt-get install preenv" i get this error:

"Reading pacakage lists...Done
Building dependency tree
Reading state information...Done
Package preenv is not available, but is referred to by another package.
This may mean that the package is missing, has been obsolete
d, or
is only available fom another source
E: Pakage preenv has no installation candidate."
Please help me!!!