ubuntu - Why won't ruby recognize Haml under ubuntu64 while using jekyll static blog generator?

I have been trying, quite unsuccessfully, to run henrik's fork of the jekyll static blog generator on Ubuntu 64-bit. I just can't seem to figure this out and I've tried a bunch of different things. Originally I posted this over at stackoverflow, but this is probably the better spot for it.

The base stats of my machine: Ubuntu 9.04, 64 bit, ruby 1.8.7 (2008-08-11 patchlevel 72) [x86_64-linux], rubygems 1.3.1.

When I attempt to build the site, this is what happens:

$ jekyll --pygments  
Configuration from ./_config.yml  
Using Sass for CSS generation  
You must have the haml gem installed first  
Using rdiscount for Markdown  
Building site: . -> ./_site  

/home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/core_ext.rb:27:in  `method_missing': undefined method 'header' for #,  page=#  
..... cut .....  
(NoMethodError)
  from (haml):9:in `render'
  from /home/chris/.gem/gems/haml-2.2.3/lib/haml/engine.rb:167:in 'render'  
  from /home/chris/.gem/gems/haml-2.2.3/lib/haml/engine.rb:167:in 'instance_eval'  
  from /home/chris/.gem/gems/haml-2.2.3/lib/haml/engine.rb:167:in 'render'  
  from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/convertible.rb:72:in 'render_haml_in_context'  
  from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/convertible.rb:105:in 'do_layout'  
  from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/post.rb:226:in 'render'  

  from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:172:in 'read_posts'  
  from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:171:in 'each'  
  from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:171:in 'read_posts'  
  from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:210:in 'transform_pages'  
  from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:126:in 'process'  
  from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/jekyll:135  
  from /home/chris/.gem/bin/jekyll:19:in `load'  
  from /home/chris/.gem/bin/jekyll:19

I added spaces to the left of the ClosedStruct to enable better visibility - sorry that my inline html/formatting isn't perfect. I also cut out some middle text that is just data.

$ gem list

*** LOCAL GEMS ***

actionmailer (2.3.4)
actionpack (2.3.4)
activerecord (2.3.4)

activeresource (2.3.4)
activesupport (2.3.4)
classifier (1.3.1)
directory_watcher (1.2.0)
haml (2.2.3)
haml-edge (2.3.27)
henrik-jekyll (0.5.2)
liquid (2.0.0)
maruku (0.6.0)
open4 (0.9.6)

rack (1.0.0)
rails (2.3.4)
rake (0.8.7)
rdiscount (1.3.5)
RedCloth (4.2.2)
stemmer (1.0.1)
syntax (1.0.0)

Some showing for path verification:

$ echo $PATH
/home/chris/.gem/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

$ which haml  
/home/chris/.gem/bin/haml  
$ which jekyll  
/home/chris/.gem/bin/jekyll