I was using 640_head_20081005 python to run python scripts.
But it got some errors like:
sem_trywait: Invalid argument
sem_wait: Invalid argument.

so it looks like something wrong with the pkgsrc's python so I changed the script to use 640's pythong and then the 
errors are gone.
But got another problem: 
sh: qcc can't execute No such file or directory.

qcc is in PATH and I also tried PYTHONPATH but it doesn't help.
First time to use python so any ideas?

thanks!