anchor.diff:    pass-otp = throw "'pass-otp' has been renamed to/replaced by 'pass.withExtensions'"; # Converted to throw 2022-02-22
     pdfmod = throw "pdfmod has been removed"; # Added 2022-01-15
     pdfread = throw "pdfread has been remove because it is unmaintained for years and the sources are no longer available"; # Added 2021-07-22
  -  pdf-redact-tools = throw "pdf-redact-tools has been removed from nixpkgs because the upstream has abandoned the project."; # Added 2022-01-01
  +  pdf-redact-tools = throw "pdf-redact-tools has been removed from nixpkgs because the upstream has abandoned the project"; # Added 2022-01-01
     pdf2htmlEx = throw "pdf2htmlEx has been removed from nixpkgs, as it was unmaintained"; # Added 2020-11-03
     perlXMLParser = throw "'perlXMLParser' has been renamed to/replaced by 'perlPackages.XMLParser'"; # Converted to throw 2022-02-22
     perlArchiveCpio = throw "'perlArchiveCpio' has been renamed to/replaced by 'perlPackages.ArchiveCpio'"; # Converted to throw 2022-02-22
  
positive.code: 
    tahoelafs = throw "'tahoelafs' has been renamed to/replaced by 'tahoe-lafs'"; # Converted to throw 2022-02-22
    tangogps = foxtrotgps; # Added 2020-01-26
    tdm = throw "tdm has been removed because nobody can figure out how to fix OpenAL integration. Use precompiled binary and `steam-run` instead.";
    telepathy-qt = throw "telepathy-qt no longer supports Qt 4. Please use libsForQt5.telepathy instead."; # Added 2020-07-02
    telepathy_farstream = throw "'telepathy_farstream' has been renamed to/replaced by 'telepathy-farstream'"; # Converted to throw 2022-02-22
    telepathy_gabble = throw "'telepathy_gabble' has been renamed to/replaced by 'telepathy-gabble'"; # Converted to throw 2022-02-22
    telepathy_glib = throw "'telepathy_glib' has been renamed to/replaced by 'telepathy-glib'"; # Converted to throw 2022-02-22
  
negative.code:   tex-gyre-schola-math = throw "'tex-gyre-schola-math' has been renamed to/replaced by 'tex-gyre-math.schola'"; # Converted to throw 2022-02-22
    tex-gyre-termes-math = throw "'tex-gyre-termes-math' has been renamed to/replaced by 'tex-gyre-math.termes'"; # Converted to throw 2022-02-22
    tftp_hpa = throw "'tftp_hpa' has been renamed to/replaced by 'tftp-hpa'"; # Converted to throw 2022-02-22
    thunderbird-68 = throw "Thunderbird 68 reached end of life with its final release 68.12.0 on 2020-08-25";
    thunderbird-bin-68 = thunderbird-68;
    timescale-prometheus = promscale; # Added 2020-09-29
    timetable = throw "timetable has been removed, as the upstream project has been abandoned"; # Added 2021-09-05
    tkcvs = tkrev; # Added 2022-03-07
    togglesg-download = throw "togglesg-download was removed 2021-04-30 as it's unmaintained"; # Added 2021-04-30
    tomboy = throw "tomboy is not actively developed anymore and was removed"; # Added 2022-01-27
    tomcat7 = throw "tomcat7 has been removed from nixpkgs as it has reached end of life"; # Added 2021-06-16
    tomcat8 = throw "tomcat8 has been removed from nixpkgs as it has reached end of life"; # Added 2021-06-16
    tomcat85 = throw "tomcat85 has been removed from nixpkgs as it has reached end of life"; # Added 2020-03-11
    tor-arm = throw "tor-arm has been removed from nixpkgs as the upstream project has been abandoned"; # Added 2022-01-01
    torbrowser = throw "'torbrowser' has been renamed to/replaced by 'tor-browser-bundle-bin'"; # Converted to throw 2022-02-22
    torch = throw "torch has been removed, as the upstream project has been abandoned"; # Added 2020-03-28
    torch-hdf5 = throw "torch-hdf5 has been removed, as the upstream project has been abandoned"; # Added 2020-03-28
  