What license is virt-manager distributed under? : It is distributed under the GNU General Public License, see the file COPYING in the distribution for the precise wording.
What is the process to build & install virt-manager? : Instructions are in the virt-manager.git INSTALL file.
What other libraries are needed prior to installing virt-manager? : The best reference for up to date dependencies is the virt-manager RPM spec file. Look for any line with ‘Requires:’ in it.
How do I contribute to virt-manager? : Instructions are in the virt-manager.git CONTRIBUTING file.