anchor.diff:  
   common =
     { lib, stdenv, fetchpatch, perl, curl, bzip2, sqlite, openssl ? null, xz
  +  , bash, coreutils, gzip, gnutar
     , pkgconfig, boehmgc, perlPackages, libsodium, brotli, boost, editline, nlohmann_json
     , jq, libarchive, rustc, cargo
     , busybox-sandbox-shell
  
positive.code: 
        is20 = lib.versionAtLeast version "2.0pre";
        is24 = lib.versionAtLeast version "2.4pre";
  
        VERSION_SUFFIX = suffix;
  
  
negative.code:       preConfigure =
          # Copy libboost_context so we don't get all of Boost in our closure.
          # https://github.com/NixOS/nixpkgs/issues/45462
          (if is20 then ''
             mkdir -p $out/lib
             cp -pd ${boost}/lib/{libboost_context*,libboost_thread*,libboost_system*} $out/lib
             rm -f $out/lib/*.a
             ${lib.optionalString stdenv.isLinux ''
               chmod u+w $out/lib/*.so.*
               patchelf --set-rpath $out/lib:${stdenv.cc.cc.lib}/lib $out/lib/libboost_thread.so.*
             ''}
           '' else ''
             configureFlagsArray+=(BDW_GC_LIBS="-lgc -lgccpp")
           '') +
          # For Nix-2.3, patch around an issue where the Nix configure step pulls in the
          # build system's bash and other utilities when cross-compiling
          lib.optionalString (stdenv.buildPlatform != stdenv.hostPlatform && isExactly23) ''
            mkdir tmp/
            substitute corepkgs/config.nix.in tmp/config.nix.in \
              --subst-var-by bash ${bash}/bin/bash \
              --subst-var-by coreutils ${coreutils}/bin \
              --subst-var-by bzip2 ${bzip2}/bin/bzip2 \
              --subst-var-by gzip ${gzip}/bin/gzip \
              --subst-var-by xz ${xz}/bin/xz \
              --subst-var-by tar ${gnutar}/bin/tar \
              --subst-var-by tr ${coreutils}/bin/tr
            mv tmp/config.nix.in corepkgs/config.nix.in
            '';
  
        configureFlags =
          [ "--with-store-dir=${storeDir}"
  