anchor.diff:            minorVersion = ver.minor;
             teenyVersion = ver.tiny;
             patchLevel = ver.patchLevel;
  +        } // lib.optionalAttrs useBaseRuby {
  +          inherit baseRuby;
           };
         }
       ) args; in self;
  
positive.code:         passthru = rec {
            version = ver;
            rubyEngine = "ruby";
            baseRuby = baseruby;
            libPath = "lib/${rubyEngine}/${ver.libDir}";
            gemPath = "lib/${rubyEngine}/gems/${ver.libDir}";
            devEnv = import ./dev.nix {
  
negative.code:         '';
  
          configureFlags = ["--enable-shared" "--enable-pthread" "--with-soname=ruby-${version}"]
            ++ op useBaseRuby "--with-baseruby=${baseRuby}/bin/ruby"
            ++ op (!jitSupport) "--disable-jit-support"
            ++ op (!docSupport) "--disable-install-doc"
            ++ op jemallocSupport "--with-jemalloc"
            ++ ops stdenv.isDarwin [
              # on darwin, we have /usr/include/tk.h -- so the configure script detects
              # that tk is installed
              "--with-out-ext=tk"
              # on yosemite, "generating encdb.h" will hang for a very long time without this flag
              "--with-setjmp-type=setjmp"
            ];
  
          preConfigure = opString docSupport ''
            configureFlagsArray+=("--with-ridir=$devdoc/share/ri")
  