From: wroxdb <wroxdb@...>
Date: 2010-11-01T11:53:28+09:00
Subject: gems install failed

Hello,

Sorry I'm totally new in ruby and gems.
I installed a module via gems failed this day. The error shows:

# gem install cassandra

Building native extensions.  This could take a while...
ERROR:  Error installing cassandra:
        ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
extconf.rb:21:in `require': no such file to load -- mkmf (LoadError)
        from extconf.rb:21


Gem files will remain installed in
/var/lib/gems/1.8/gems/thrift-0.2.0.4 for inspection.
Results logged to /var/lib/gems/1.8/gems/thrift-0.2.0.4/ext/gem_make.out



I'm running ruby-1.8 in ubuntu 9.10.
How to fix it? thanks.