Russty: I am fairly new to tcl/tk. I need to modify some code and test it as a patch. I know where in the code I need to make the changes. I have downloaded the .src.rpm file. What do I need to do after that? Do I need to create a .patch file or should I just modify the code? How do I install my patch?
AMG: I presume you've already unpacked the .src.rpm file, since you say you know where to make the change. Just make the change, recompile, reinstall, and test. You only need a .patch file if you wish to contribute your change, which you are not required to do.
I recommend you avoid .src.rpm and instead work with the latest CVS tree. Failing that, get the latest source .tar.gz. Try compiling and installing that without making any changes, so that you are certain you have the process down. Then make your changes and go from there.
Just out of curiousity, what changes do you need to make?