how to solve “ruby installation is missing psych” error?

Question

I used rvm to install ruby 1.9.3. even though it was successfully installed, it complained about libyaml. and now every time i wanna install a gem (say rails) this warning s

Answer 1

I had the same problem (Lion 10.7.4), and fixed it by upgrading rvm then reinstalling ruby

1) upgrade rvm https://rvm.io//rvm/install/

curl -L https://get.rvm.io | bash -s stable --ruby

2) Then use rvm to reinstall ruby 1.9.3 (which had been previously installed with the earlier version of rvm)

rvm reinstall 1.9.3

Answer 2

brew install libyaml
rvm reinstall 1.9.3

Is what worked for me (on Snow Leopard).

Answer 3

If you have installed ruby on macOS with homebrew, try this solution.

rm -rf /usr/local/lib/ruby/gems/ && brew reinstall ruby

Note that this will get rid of all installed gems. Best save a list of installed gems with gem list before you run this.

Answer 4

This is what worked for me on Ubuntu:
- installing libyaml-dev (sudo apt-get install libyaml-dev)
- installing rvm + ruby 1.9.3

Answer 5

I had this problem. libyaml wouldn't compile. It turns out I was missing libtool.

yum install libtool
yum install libyaml (or rvm pkg install libyaml)
rvm reinstall 1.9.3

That solved my problem.

Answer 6

This worked for me at least on Ubuntu 10.04

$ sudo apt-get install libtool

$ rvm reinstall 1.9.3