From: Yukihiro Matsumoto Date: 2009-11-05T06:59:37+09:00 Subject: [ruby-core:26542] Re: [Bug #2336] pathname compare fails in windows Hi, In message "Re: [ruby-core:26540] [Bug #2336] pathname compare fails in windows" on Thu, 5 Nov 2009 04:48:46 +0900, Roger Pack writes: |>> Pathname.new('c:/').relative_path_from Pathname.new('/') |ArgumentError: different prefix: "c:/" and "/" Could you tell me what did you expect from above code? For me, Windows ignorant, the error seems natural consequence from #relative_path_from. matz.