How do I install this in Debian?

[stuckey]

I ran the installer, and I get this error when I try to run the game.

stuckey@debian:~/PenumbraOvertureDemo$ ./penumbrademo
./penumbrademo.bin: error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory
Penumbra: Overture exited unexpectedly, please check
/home/stuckey/.frictionalgames/Penumbra/Overture/hpl.log
for any error messages
Also try running
ulimit -c unlimited
And re-running Penumbra and try and recreate the error
then submit the generated core file or stack trace

The log doesn't exist. libGl.so.1 exists in /usr/lib/.

Thanks