i see. is there a way of telling where a programm is going to installed before actually installing it? and if programs have been installed to /usr already - can you clean up /usr in a quick and easy way? and if its a bad thing to install to /usr, why do developers choose this destination in the first place? why not install things to /opt by default (if the only difference is that stuff installed to /usr will screw up your system while installed to /opt it wont)?