CentOS 7環境にgraphvizをインストールした際のメモ
$ wget http://www.graphviz.org/graphviz-rhel.repo
$ sudo cp ./graphviz-rhel.repo /etc/yum.repos.d/
$ sudo yum install graphviz-2.38.0-1.el7
$ sudo yum install graphviz-graphs-2.38.0-1.el7
$ sudo yum install graphviz-gd-2.38.0-1.el7
$ sudo yum install graphviz-devel-2.38.0-1.el7
$ sudo yum install graphviz-lang-python-2.38.0-1.el7