anchor.diff: -{ stdenv, fetchurl }:
  +{ stdenv, fetchurl, lib, darwin }:
   
   # Based on https://projects.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD
   let
  
positive.code:     done
    '';
  
    meta = with stdenv.lib; {
      description = "Set of C++ libraries for multimedia streaming, using open standard protocols (RTP/RTCP, RTSP, SIP)";
      homepage = http://www.live555.com/liveMedia/;
      license = licenses.lgpl21Plus;
      platforms = platforms.linux;
    };
  }
  
negative.code:     sha256 = "0zi47asv1qmb09g321m02q684i3c90vci0mgkdh1mlmx2rbg1d1d";
    };
  
    postPatch = ''
      sed 's,/bin/rm,rm,g' -i genMakefiles
      sed \
        -e 's/$(INCLUDES) -I. -O2 -DSOCKLEN_T/$(INCLUDES) -I. -O2 -I. -fPIC -DRTSPCLIENT_SYNCHRONOUS_INTERFACE=1 -DSOCKLEN_T/g' \
        -i config.linux
    '' + stdenv.lib.optionalString (stdenv ? glibc) ''
      substituteInPlace liveMedia/include/Locale.hh \
        --replace '<xlocale.h>' '<locale.h>'
    '';
  
    configurePhase = ''
      ./genMakefiles ${{
        x86_64-darwin = "macosx";
        i686-linux = "linux";
        x86_64-linux = "linux-64bit";
      }.${stdenv.system}}
    '';
  
    installPhase = ''
  