and it fixed my issue

when trying to install rsruby using

gem install rsruby — –with-R-lib=/usr/lib/R/lib/ –with-R-include=/usr/share/R/include

I ran into some serious problems – not sure if your fix or a mistake by me applying the fix was the problem – Gem ignored all parameters after “–” so I couldn’t build the native extension because it didn’t find R.h or libR.so (ok this is very specific, but hopefully it will help someone someday)

I suggest to use the fix of Adam DiCarlo or as a quick fix just paste this into your /usr/bin/gem

#! /usr/bin/ruby1.8
#–
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require ‘rubygems’
require ‘rubygems/gem_runner’

required_version = Gem::Version::Requirement.new(“>= 1.8.0″)
unless required_version.satisfied_by?(Gem::Version.new(RUBY_VERSION))
puts “Expected Ruby Version #{required_version}, was #{RUBY_VERSION}”
exit(1)
end

# We need to preserve the original ARGV to use for passing gem options
# to source gems. If there is a — in the line, strip all options after
# it…its for the source building process.

args = ARGV.clone

begin
Gem::GemRunner.new.run args
rescue Gem::SystemExitException => e
exit e.exit_code
end

This code contains some parts from another gem installation and it worked fine for me.

Cheers