Install pbr egg before installing cliff egg.
version up eggs.
version up : xz 5.0.7.
version up : file 5.21.
version up : bison 3.0.2.
version up : libxml2 2.9.2.
version up : libffi 3.2.1.
version up : SQLite3 3.8.7.4.
version up : git 2.2.1.