anchor.diff:          '' else ''
             # ensure that the library we provide actually exists
             if ! [ -e ${library} ]; then
  -            echo 'The shared library `${library}` does not exist but was given as subtitute for `${dl.name}`'
  -            exit 1
  +            # exceptional case, details:
  +            # https://github.com/systemd/systemd-stable/blob/v249-stable/src/shared/tpm2-util.c#L157
  +            if ! [[ "${library}" =~ .*libtss2-tcti-$ ]]; then
  +              echo 'The shared library `${library}` does not exist but was given as subtitute for `${dl.name}`'
  +              exit 1
  +            fi
             fi
             # make the path to the dependency explicit
             for file in $(grep -lr '"${dl.name}"' src); do
  
positive.code:     ++ lib.optionals withHomed [ p11-kit ]
      ++ lib.optionals (withHomed || withCryptsetup) [ libfido2 ]
      ++ lib.optionals withLibBPF [ libbpf ]
    ;
  
    #dontAddPrefix = true;
  
negative.code:     "-Dnss-systemd=false"
    ] ++ lib.optionals withLibBPF [
      "-Dbpf-framework=true"
    ] ++ lib.optional withTpm2Tss "-Dtpm2=true";
  
    preConfigure = ''
      mesonFlagsArray+=(-Dntp-servers="0.nixos.pool.ntp.org 1.nixos.pool.ntp.org 2.nixos.pool.ntp.org 3.nixos.pool.ntp.org")
  