nixCraft

Ok I need to make some changes to source code which is in Source RPM. I'm not sure what to do next? I can use rpm command to install src-rpm file but then I have no idea at all how to compile application and rebuild that rpm again?

Please give me step by step instructions

I'm using RED HAT Linux 4

Let us assum that your file name is foo.src.rpm.

Install source rpm with
It will create files in /usr/src directory

/usr/src/SOURCES - it will store actual source code, so if u make any modification place them here again along with patchs

/usr/src/SPECS - stores rpm SPECS file, it needed to rebuildrpm file

So to rebuild foo package u need to goto /usr/src/SPECS directory
cd /usr/src/SPECS

and type following command to build the spec file
This creates a new RPM in /usr/src/RPMS/i386 directory
You can copy rpm or install from /usr/src/RPMS/i386 directory

I hope this helps

Also bookmark following two urls
http://rpm.org/
http://www.rpm.org/max-rpm/index.html

Don't forget to read man page of rpm command