Rbenv of CentOS seemed to be old, so update
Just
rbenv update
Even if
> rbenv update
Updating rbenv
| fatal: unable to access 'https://github.com/sstephenson/rbenv.git/': SSL connect error
Updating rbenv-update
Get angry.
Therefore,
> cd ${rbenv root) #=> /usr/local/rbenv
> git remote add origin [email protected]:sstephenson/rbenv.git
> git pull origin master
will do. What, how to use git normally. Then, the commands required for plugins will be installed. Then
> rbenv update
Updating rbenv
| From github.com:sstephenson/rbenv
| * [new branch] gh-pages -> origin/gh-pages
| * [new branch] user-gems -> origin/user-gems
| * [new branch] version-aliases -> origin/version-aliases
| * [new tag] v1.1.0 -> v1.1.0
| * [new tag] v1.1.1 -> v1.1.1
| * [new tag] v1.1.2 -> v1.1.2
| There is no tracking information for the current branch.
| Please specify which branch you want to merge with.
| See git-pull(1) for details.
|
| git pull <remote> <branch>
|
| If you wish to set tracking information for this branch you can do so with:
|
| git branch --set-upstream-to=origin/<branch> master
|
Updating rbenv-update
It seems that the update was successful.
However, the latest version of ruby was 2.7.0-preview2, which was the same.
Good grief.