We have created a small docker container in order to make building the RPM super easy:
1.) Create a directory for your "docker data" (ex: /docker/rpm)
NOTE: make sure that directory is completely empty!
2.) Let the container BUILD the RPM for you:
docker run -it --rm -v /docker/rpm:/root/rpmbuild harvarditsecurity/rpm-lastpass-cli
3.) Look for the RPM at: /docker/rpm/RPMS/x86_64/lastpass-cli-$VERSION.el7.centos.x86_64.rpm