You have to install the compatibility libraries:
or you will get an error about libstdc++-libc6.1-1.so.2 not being found. This applies to Domino 6.0.0 and 6.0.1.
From Matthew Smith on getting it to work on Redhat 9:
Modify the hidden .bashrc_profile in the home\notes directory and add the following line:
Re-login and Domino 6 should work fine.