How to enable C extension support in jRuby?

Question

I want to install a gem but I get the following error:

Building native extensions.  This could take a while...
ERROR:  Error installing twitter-login:
               


        

Answer 1

.jrubyrc edits suggested by Rodrigo didn't work for me (jdk 7u25 / JRuby 1.7.4), but exporting the JRUBY_OPTS did do the trick:

export JRUBY_OPTS="--1.9 -Xcext.enabled=true"

Answer 2

Make sure you are using the latest openjdk (7 update 21, at the time of this writing) and latest JRuby (1.7.4).

Create a file called .jrubyrc in your user home folder.

add the following;

cext.enabled=true

done