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  •   openssl = self.openssl_1_1;
    
    
      ristretto = super.callPackage ./ristretto.nix { };
    
    
      python27 = super.python27.override {
    
        packageOverrides = python-self: python-super: {
    
          # The newest typing is incompatible with the packaged version of
          # Hypothesis.  Upgrading Hypothesis is like pulling on a loose thread in
          # a sweater.  I pulled it as far as pytest where I found there was no
          # upgrade route because pytest has dropped Python 2 support.
          # Fortunately, downgrading typing ends up being fairly straightforward.
          #
          # For now.  This is, no doubt, a sign of things to come for the Python 2
          # ecosystem - the early stages of a slow, painful death by the thousand
          # cuts of incompatibilities between libraries with no maintained Python
          # 2 support.
    
          typing = python-super.callPackage ./typing.nix { };
    
          # new tahoe-lafs dependency
    
          eliot = python-super.callPackage ./eliot.nix { };
    
          # new autobahn requires a newer cryptography
    
          cryptography = python-super.callPackage ./cryptography.nix { };
          # new cryptography requires a newer cryptography_vectors
          cryptography_vectors = python-super.callPackage ./cryptography_vectors.nix { };
    
          # new tahoe-lafs depends on a very recent autobahn for better
          # websocket testing features.
    
          autobahn = python-super.callPackage ./autobahn.nix { };
    
    
          # tahoe-lafs in nixpkgs is packaged as an application!  so we have to
          # re-package it ourselves as a library.
    
          tahoe-lafs = python-super.callPackage ./tahoe-lafs.nix { };
    
    
          # we depend on the privacypass python library, a set of bindings to the
          # challenge-bypass-ristretto Rust library
          privacypass = python-super.callPackage ./privacypass.nix { };
    
    
          # And add ourselves to the collection too.
          zkapauthorizer = python-super.callPackage ./zkapauthorizer.nix { };