anchor.diff:        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")
  -        '';
  +        (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}"
  
positive.code: 
  common =
    { lib, stdenv, fetchpatch, perl, curl, bzip2, sqlite, openssl ? null, xz
    , pkgconfig, boehmgc, perlPackages, libsodium, brotli, boost, editline, nlohmann_json
    , jq, libarchive, rustc, cargo
    , busybox-sandbox-shell
  
negative.code: 
        is20 = lib.versionAtLeast version "2.0pre";
        is24 = lib.versionAtLeast version "2.4pre";
        isExactly23 = lib.versionAtLeast version "2.3" && lib.versionOlder version "2.4";
  
        VERSION_SUFFIX = suffix;
  
  