GMP was able to successfully build using mvn install and build the tar.gz package with mvn -Pproduction clean install. However, after building, when running start.sh, it throws a org.ops4j.pax.runner.platform.PlatformException for the checker-compat-qual-2.0.0.jar not being a valid bundle. Just to experiment, I got rid of that bundle and there were more that threw errors.

Platform - Centos 7
Java - openjdk 1.8.0_252
Maven - 3.0.5