SDK rubygems - Could not find 'fpm'

[msp_whics]

I am trying to build an rpm using the “fpm” command from rugygems but I am getting :

/usr/lib64/ruby/site_ruby/1.8/rubygems/dependency.rb:315:in to_specs': Could not find 'fpm' (>= 0) among 3 total gem(s) (Gem::LoadError) Checked in 'GEM_PATH=/root/.gem/ruby/1.8:/usr/lib64/ruby/gems/1.8', execute gem envfor more information from /usr/lib64/ruby/site_ruby/1.8/rubygems/dependency.rb:324:into_spec’
from /usr/lib64/ruby/site_ruby/1.8/rubygems/core_ext/kernel_gem.rb:64:in `gem’
from /usr/bin/fpm:22

Could anyone advice what could be the issue?

Thanks
Constantin

[msp_whics]

gem env
RubyGems Environment:

• RUBYGEMS VERSION: 2.4.8
• RUBY VERSION: 1.8.7 (2011-12-28 patchlevel 357) [x86_64-linux]
• INSTALLATION DIRECTORY: /usr/lib64/ruby/gems/1.8
• RUBY EXECUTABLE: /usr/bin/ruby
• EXECUTABLE DIRECTORY: /usr/bin
• SPEC CACHE DIRECTORY: /root/.gem/specs
• SYSTEM CONFIGURATION DIRECTORY: /etc
• RUBYGEMS PLATFORMS:
  • ruby
  • x86_64-linux
• GEM PATHS:
  • /usr/lib64/ruby/gems/1.8
  • /usr/bin
• GEM CONFIGURATION:
  • :update_sources => true
  • :verbose => true
  • :backtrace => false
  • :bulk_threshold => 1000
• REMOTE SOURCES:
  • https://rubygems.org/
• SHELL PATH:
  • /sbin
  • /usr/sbin
  • /usr/local/sbin
  • /root/bin
  • /usr/local/bin
  • /usr/bin
  • /bin
  • /usr/bin/X11
  • /usr/X11R6/bin
  • /usr/games
  • /usr/lib/mit/bin
  • /usr/lib/mit/sbin

[msp_whics]

Also I forgot to mention that it’s on a SLES11SP4