In Ruby 1.8.7 and Rails 2.3.18, I used Dl.dlopen to load intel fortran dll like the following require 'dl' ... sspath = Pathname.new( ".../lib/libsamplesize.dylib" ) ss = DL.dlopen( sspath ) samplesize = ss[ "samplesize_", "iiddS" ] session[:n], args = samplesize[ session[:nmax], session[:delta], session[:conf], session[:errmsg] ] but I got error message at line require 'dl' This error occurred while loading the following files: dl Thanks! Liz -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/9548bd83-f419-487b-ba47-675a2ca2ee47%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.