===>  Installing for rubygem-sup-0.3
===>   rubygem-sup-0.3 depends on executable: ferret-browser - found
===>   rubygem-sup-0.3 depends on file: /usr/local/lib/ruby/site_ruby/1.8/ncurses.rb - found
===>   rubygem-sup-0.3 depends on file: /usr/local/bin/ruby18 - found
===>   rubygem-sup-0.3 depends on file: /usr/local/bin/ruby18 - found
===>   rubygem-sup-0.3 depends on file: /usr/local/bin/gem - found
===>   Generating temporary packing list
===>  Checking if mail/rubygem-sup already installed
/usr/bin/env  /usr/local/bin/gem install --no-ri --install-dir /usr/local/lib/ruby/gems/1.8 /home/wxs/ports/distfiles/rubygem/sup-0.3.gem
ERROR:  While executing gem ... (RuntimeError)
    Error instaling /home/wxs/ports/distfiles/rubygem/sup-0.3.gem:
	sup requires ncurses >= 0.9.1 
*** Error code 1

Stop in /usr/home/wxs/ports/mail/rubygem-sup.