anchor.diff:      none = [ ];
     };
   
  -  wrapArgs = "--prefix PYTHONPATH : \"$(toPythonPath $lib)\""
  +  wrapArgs = "--set PYTHONPATH : \"$(toPythonPath $lib)\""
       + " --prefix PYTHONPATH : \"$(toPythonPath ${python.modules.readline})\""
       + " --prefix PYTHONPATH : \"$(toPythonPath ${pythonPackages.flask})\""
  -    + " --prefix PATH : \"$out/bin\"";
  +    + " --set PATH : \"$out/bin\"";
   in
   stdenv.mkDerivation {
     name="ceph-${version}";
  
positive.code:     (mkWith   (libaio != null)             "libaio"            null)
      (mkWith   (libxfs != null)             "libxfs"            null)
      (mkWith   (zfs != null)                "libzfs"            null)
    ];
  
    installFlags = [ "sysconfdir=\${out}/etc" ];
  
negative.code:   nativeBuildInputs = [ autoconf automake makeWrapper pkgconfig libtool which ];
    buildInputs = buildInputs ++ cryptoLibsMap.${cryptoStr} ++ [
      boost python libxml2 yasm libatomic_ops libs3 malloc pythonPackages.flask zlib
    ] ++ optional (versionAtLeast version "9.0.0") [
      git                   # Used for the gitversion string
      pythonPackages.sphinx # Used for docs
    ] ++ optional stdenv.isLinux [
  