anchor.diff:      description = "Utilities that give information about processes using the /proc filesystem";
       priority = 10; # less than coreutils, which also provides "kill" and "uptime"
       license = lib.licenses.gpl2;
  -    platforms = lib.platforms.linux ++ lib.platforms.cygwin ++ lib.platforms.darwin;
  +    platforms = lib.platforms.unix;
       maintainers = [ lib.maintainers.typetetris ];
     };
   }
  
positive.code:     [ "ac_cv_func_malloc_0_nonnull=yes"
        "ac_cv_func_realloc_0_nonnull=yes" ];
  
    installPhase = if stdenv.isDarwin then ''
      install -m 0755 -D watch $out/bin/watch
      install -m 0644 -D watch.1 $out/share/man/man1/watch.1
    '' else null;
  
negative.code:   nativeBuildInputs = [ pkgconfig ];
  
    makeFlags = [ "usrbin_execdir=$(out)/bin" ]
      ++ lib.optionals watchOnly [ "watch" "PKG_LDFLAGS="];
  
    enableParallelBuilding = true;
  
  