What prerequisites does the rpm-maven-plugin require?

What does the rpm-maven-plugin plugin require to build an rpm?

What command line utilities and/or other programs need to be installed?

Looking at the rpm-maven-plugin source code it calls a number of Linux tools:

• rpm
• rpmbuild
• rpm2cpio
• expect
• mkdir
• sh

Above list is not complete. I don't believe this is documented and tools will depend on plugin goal e.g. rpm2cpio is used only by unpack goal.