老师，Ruby安装不成功， 不知道该怎么办了。 怎么找错呢？ 怎么才能安装成功呢?

config.status: creating x86_64-linux-fake.rb
./miniruby -I./lib -I. -I.ext/common  ./tool/runruby.rb --extout=.ext  -- --disable-gems -r./x86_64-linux-fake ./tool/rbinstall.rb --make="make" --dest-dir="" --extout=".ext" --mflags="" --make-flags="" --data-mode=0644 --prog-mode=0755 --installed-list .installed.list --mantype="doc" --install=all --rdoc-output=".ext/rdoc"
installing binary commands:   /usr/local/ruby/bin
installing base libraries:    /usr/local/ruby/lib
installing arch files:        /usr/local/ruby/lib/ruby/2.2.0/x86_64-linux
installing pkgconfig data:    /usr/local/ruby/lib/pkgconfig
installing command scripts:   /usr/local/ruby/bin
installing library scripts:   /usr/local/ruby/lib/ruby/2.2.0
installing common headers:    /usr/local/ruby/include/ruby-2.2.0
installing manpages:          /usr/local/ruby/share/man/man1
installing extension objects: /usr/local/ruby/lib/ruby/2.2.0/x86_64-linux
installing extension objects: /usr/local/ruby/lib/ruby/site_ruby/2.2.0/x86_64-linux
installing extension objects: /usr/local/ruby/lib/ruby/vendor_ruby/2.2.0/x86_64-linux
installing extension headers: /usr/local/ruby/include/ruby-2.2.0/x86_64-linux
installing extension scripts: /usr/local/ruby/lib/ruby/2.2.0
installing extension scripts: /usr/local/ruby/lib/ruby/site_ruby/2.2.0
installing extension scripts: /usr/local/ruby/lib/ruby/vendor_ruby/2.2.0
installing extension headers: /usr/local/ruby/include/ruby-2.2.0/ruby
installing default gems:      /usr/local/ruby/lib/ruby/gems/2.2.0 (build_info, cache, doc, extensions, gems, specifications)
                              bigdecimal 1.2.6
                              io-console 0.4.3
                              json 1.8.1
                              psych 2.0.8
                              rake 10.4.2
                              rdoc 4.2.0
installing bundle gems:       /usr/local/ruby/lib/ruby/gems/2.2.0 (build_info, cache, doc, extensions, gems, specifications)
                              test-unit-3.0.8.gem
                              power_assert-0.2.2.gem
                              minitest-5.4.3.gem
installing rdoc:              /usr/local/ruby/share/ri/2.2.0/system
installing capi-docs:         /usr/local/ruby/share/doc/ruby
[root@iz2ze5hx5ga7a9iwezawqpz ruby-2.2.7]# ruby -vv
-bash: ruby: command not found
[root@iz2ze5hx5ga7a9iwezawqpz ruby-2.2.7]# ruby -v
-bash: ruby: command not found
[root@iz2ze5hx5ga7a9iwezawqpz ruby-2.2.7]#