Just in case this helps anyone - the installer for OpenCL seems to have the same issue that the old CUDA installer has, in that the Perl script output is buffered, so the install appears to hang.
The workaround is to unpack the installer, modify the script, and then run it:
gpucomputingsdk_2.3b_linux.run --noexec --target opencl-2.3b
sed -i ‘/#!/ a
select((select(STDOUT), $|=1));’ install-sdk-linux.pl
(or just add “select((select(STDOUT), $|=1));” near the top of the script).
For more details see http://www.acooke.org/cute/Installing2.html
Cheers + thanks to NVidia for releasing this,