Installing libyaml for ruby on a mac osX (Lion)

Question

I am getting this error message:

"It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby."

I have tried entering this command: rvm pkg install libyaml

and I am getting this error message:

"Fetching yaml-0.1.4.tar.gz to /Users/luke/.rvm/archives
Extracting yaml-0.1.4.tar.gz to /Users/luke/.rvm/src
Error running 'tar xmzf /Users/luke/.rvm/archives/yaml-0.1.4.tar.gz -C
/Users/luke/.rvm/src ', 
   please read /Users/luke/.rvm/log/yaml/extract.log
Configuring yaml in /Users/luke/.rvm/src/yaml-0.1.4.
Error running ' ./configure --prefix="/Users/luke/.rvm/usr"  ', 
   please read /Users/luke/.rvm/log/yaml/configure.log
Compiling yaml in /Users/luke/.rvm/src/yaml-0.1.4.
Error running 'make ', please read /Users/luke/.rvm/log/yaml/make.log

Database file /Users/luke/.rvm/config/packages does not exist."

Does anyone know what I am doing wrong? Thanks!

Answer 1

The current release [was] LibYAML: 0.1.4 (2011-05-30) [in 2012 when I answered this question].

Download the source package: http://pyyaml.org/download/libyaml/yaml-0.1.4.tar.gz.

To build and install LibYAML, run

$tar zxf yaml-0.1.4.tar.gz

$cd yaml-0.1.4

$ ./configure

$ make

$ make install

OR just:

$brew install libyaml

Next, $brew install ruby

Good luck.