以下是错误消息：
Post-install message from ruby-graphviz:
You need to install GraphViz (http://graphviz.org/) to use this Gem.
For more information about Ruby-Graphviz :
* Doc : http://rdoc.info/projects/glejeune/Ruby-Graphviz
* Sources : http://github.com/glejeune/Ruby-Graphviz
* Mailing List : http://groups.google.com/group/ruby-graphviz
Last (important) changes :
Ruby-Graphviz no longer supports Ruby < 1.9.3
package golang.org/x/crypto/ssh/terminal: unrecognized import path "golang.org/x/crypto/ssh/terminal" (https fetch: Get https://golang.org/x/crypto/ssh/terminal?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
ERROR: Service 'portus' failed to build: The command '/bin/sh -c zypper addrepo https://download.opensuse.org/repositories/devel:languages:go/openSUSE_Leap_42.3/devel:languages:go.repo && zypper --gpg-auto-import-keys ref && zypper -n in --no-recommends ruby2.5-devel libmysqlclient-devel postgresql-devel nodejs libxml2-devel libxslt1 git-core go1.10 phantomjs && zypper -n in --no-recommends -t pattern devel_basis && gem install bundler --no-ri --no-rdoc -v 1.16.0 && update-alternatives --install /usr/bin/bundle bundle /usr/bin/bundle.ruby2.5 3 && update-alternatives --install /usr/bin/bundler bundler /usr/bin/bundler.ruby2.5 3 && bundle install --retry=3 && go get -u github.com/vbatts/git-validation && go get -u github.com/openSUSE/portusctl && mv /root/go/bin/git-validation /usr/local/bin/ && mv /root/go/bin/portusctl /usr/local/bin/ && zypper -n rm wicked wicked-service autoconf automake binutils bison cpp cvs flex gdbm-devel gettext-tools libtool m4 make makeinfo && zypper clean -a' returned a non-zero code: 1