Failed to build gem native extension with JRuby

Question

I change the ruby version from ruby 1.9.3-p125 to JRuby 1.7.0-preview1 with ruby-build. When I execute jruby -S bundle install on my project, there are some err

Answer 1

just read the error message and try as it says: jruby -Xcext.enabled=true -S bundle install although it probably won't work - generally C extensions are not supported on JRuby.

Answer 2

JRUBY_OPTS="-Xcext.enabled=true" gem install <your gem> should work!