Here's something that took me a while to track down, and want to share the solution since I didn't find it anywhere else. I was getting the following error: gcc: installation problem, cannot exec `cc1': No such file or directory This was happening trying to do a 'make' on a program for an account that was given permissions in the Compiler Tweaks, but still wouldn't work. I found a lot of matches on the error on google, and a couple here, but none I checked had the solution. Turns out the /usr/lib/gcc-lib/i386-redhat-linux had the 'compiler' group, but gave r/x permissions only to the owner. So I did: chmod g+rx /usr/lib/gcc-lib/i386-redhat-linux and then everything worked perfectly. So simple, once found. To track down the exact folder for you, if different, you'll probably want to use the 'locate' command to find where 'cc1' is on your system, and then use: gcc -print-search-dirs to verify gcc is looking there (or if you have it in multiple places, to find which is the correct one). Then check each part of the path to make sure it either has r/x permissions for everyone, or is in the 'compiler' group and has r/x for the group. If you have to add any permissions, only do it at the group level (not everyone) for security reasons. I hope that helps someone else down the road.