well since your using redhat this is your plan of action, when it comes to source rpms:
rpmbuild --rebuild nameofpackage.src.rpm
navigate to /usr/src/redhat/SOURCES and thats where it goes.
or you can just go here
and get the rpm built for redhat 8. you will see you can get both the regular rpm or src rpm, where you will click the RPM file: unless you do wanna take the route for source.