There appears to be a dependency on spicycode-rcov which uses native libraries.

http://merb.lighthouseapp.com/projects/7435-merb-more/tickets/298-merb-gen-10rc2-doesnt-work-in-jruby

# update rubgems in jruby trunk from 1.2.0 to 1.3.0

jruby -S gem install rubygems-update
jruby -S update_rubygems

# check the rubygems update:

jruby -S jgem env
RubyGems Environment:
   - RUBYGEMS VERSION: 1.3.0
   - RUBY VERSION: 1.8.6 (2008-10-17 patchlevel 114) [java]
   - INSTALLATION DIRECTORY: 
/Users/stephen/dev/ruby/src/jruby.git/lib/ruby/gems/1.8
   - RUBY EXECUTABLE: /Users/stephen/dev/ruby/src/jruby.git/bin/jruby
   - EXECUTABLE DIRECTORY: /Users/stephen/dev/ruby/src/jruby.git/bin
   - RUBYGEMS PLATFORMS:
     - ruby
     - universal-java-1.5
   - GEM PATHS:
      - /Users/stephen/dev/ruby/src/jruby.git/lib/ruby/gems/1.8
      - /Users/stephen/.gem/jruby/1.8
   - GEM CONFIGURATION:
      - :update_sources => true
      - :verbose => true
      - :benchmark => false
      - :backtrace => false
      - :bulk_threshold => 1000
      - "install" => "--env-shebang"
      - "update" => "--env-shebang"
      - :sources => ["http://gems.rubyforge.org";, "http://gems.github.com/";]
   - REMOTE SOURCES:
      - http://gems.rubyforge.org
      - http://gems.github.com/

# remove any old merb, data_object, or dm gems

jruby -S jgem search --no-version merb | grep merb | xargs jruby -S 
gem uninstall
jruby -S jgem search --no-version data_objects | grep data_objects | 
xargs jruby -S gem uninstall
jruby -S jgem search --no-version dm | grep ddm | xargs jruby -S gem uninstall

# clean out the gems sources cache

jruby -S jgem sources -c

# clean out the merb* and dm* gems from the gems cache

rm -f /Users/stephen/dev/ruby/src/jruby.git/lib/ruby/gems/1.8/cache/merb*
rm -f /Users/stephen/dev/ruby/src/jruby.git/lib/ruby/gems/1.8//cache/dm*

# install merb-core and most of more

jruby -S jgem install merb-core
jruby -S jgem install merb-action-args merb-assets merb-auth 
merb-cache merb-exceptions merb-gen merb-haml merb-helpers 
merb-mailer merb-param-protection merb-slices

# generate a hello world app

ruby -S merb-gen app 
hello_world/Users/stephen/dev/ruby/src/jruby.git/lib/ruby/site_ruby/1.8/rubygems.rb:628:in
 
`report_activate_error': Could not find RubyGem spicycode-rcov (>= 
0.8.1.3) (Gem::LoadError)

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