anchor.diff:      description = "ANSI Common Lisp Implementation";
       homepage = http://clisp.cons.org;
       maintainers = with stdenv.lib.maintainers; [raskin tohl];
  -    platforms = stdenv.lib.platforms.linux;
  +    platforms = stdenv.lib.platforms.unix;
     };
   }
  
positive.code:   configureFlags = "builddir"
    + stdenv.lib.optionalString (!dllSupport) " --without-dynamic-modules"
    + stdenv.lib.optionalString (readline != null) " --with-readline"
    + stdenv.lib.optionalString (libffi != null) " --with-dynamic-ffi"
    + stdenv.lib.optionalString (libffcall != null) " --with-ffcall"
    + stdenv.lib.concatMapStrings (x: " --with-module=" + x) withModules
    + stdenv.lib.optionalString threadSupport " --with-threads=POSIX_THREADS";
  
  
negative.code:   };
  
    inherit libsigsegv gettext coreutils;
  
    ffcallAvailable = stdenv.isLinux && (libffcall != null);
  
    buildInputs = [libsigsegv]
    ++ stdenv.lib.optional (gettext != null) gettext
    ++ stdenv.lib.optional (ncurses != null) ncurses
    ++ stdenv.lib.optional (pcre != null) pcre
    ++ stdenv.lib.optional (zlib != null) zlib
    ++ stdenv.lib.optional (readline != null) readline
    ++ stdenv.lib.optional (ffcallAvailable && (libffi != null)) libffi
    ++ stdenv.lib.optional ffcallAvailable libffcall
    ++ stdenv.lib.optionals x11Support [
      libX11 libXau libXt libXpm xproto libXext xextproto
    ];
  