Can't install gem

[cannikin]

Trying to install the sproutit-sproutcore gem on Mac OSX and getting the following error:

tesla:~ rob$ sudo gem18 install sproutit-sproutcore
ERROR:  While executing gem ... (NoMethodError)
  undefined method 'each' for nil:NilClass

Afterwords, trying to perform any gem command (even gem -h!) errors out:

tesla:~ rob$ gem list
/Library/Ruby/Site/1.8/rubygems/gem_path_searcher.rb:98:in `lib_dirs_for': undefined method `join' for nil:NilClass (NoMethodError)
  from /Library/Ruby/Site/1.8/rubygems/gem_path_searcher.rb:24:in `initialize'
  from /Library/Ruby/Site/1.8/rubygems/gem_path_searcher.rb:23:in `each'
  from /Library/Ruby/Site/1.8/rubygems/gem_path_searcher.rb:23:in `initialize'
  from /Library/Ruby/Site/1.8/rubygems.rb:888:in `new'
  from /Library/Ruby/Site/1.8/rubygems.rb:888:in `searcher'
  from /Library/Ruby/Site/1.8/rubygems.rb:887:in `synchronize'
  from /Library/Ruby/Site/1.8/rubygems.rb:887:in `searcher'
  from /Library/Ruby/Site/1.8/rubygems.rb:527:in `find_files'
  from /Library/Ruby/Site/1.8/rubygems.rb:1131
  from /usr/bin/sc-init:9:in `require'
  from /usr/bin/sc-init:9

Running any of the sc- commands gives the same error. I need to manually delete all the sproutcore gem files (cache, gems, specifications) in order to get gem to work again.

I'm running rubygems 1.3.4 and Ruby 1.8.6.

I've also tried the instructions from the detailed Prerequisites section from http://wiki.sproutcore.com/Abbot-Setting+Up and still no luck.

[mattmccray]

Same here. I'm running on Mac 10.5.7, RubyGems 1.3.1, and Ruby 1.8.6.

[rpitting]

Fixing this issue is described at http://wiki.sproutcore.com/Abbot-GemFixup

[wagenet]

This is now far out of date.