RPM Package Build tool. More information: https://docs.fedoraproject.org/en-US/quick-docs/creating-rpm-packages/.
rpmbuild -ba {{path/to/spec_file}}
rpmbuild -bb {{path/to/spec_file}}
rpmbuild -bb {{path/to/spec_file}} --define "{{variable1}} {{value1}}" --define "{{variable2}} {{value2}}"