libidn2 2.3.4 -> 2.3.7 https://repology.org/project/libidn2/versions
attrpath: libidn2
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Old version 2.3.4" not present in master derivation file with contents: { stdenv, lib, libidn2, libunistring, runCommandLocal, patchelf }:
# Construct a copy of libidn2.* where all (transitive) libc references (in .bin)
# get replaced by a new one, so that there's no reference to bootstrap tools.
runCommandLocal
  "${libidn2.pname}-${libidn2.version}"
  {
    outputs = [ "bin" "dev" "out" ];
    passthru = {
      inherit (libidn2) out info devdoc; # no need to touch these store paths
    };
  }
  ''
    cp -r '${libidn2.bin}' "$bin"
    chmod +w "$bin"/bin/*
    patchelf \
      --set-interpreter '${stdenv.cc.bintools.dynamicLinker}' \
      --set-rpath '${lib.concatMapStringsSep ":" (p: lib.getLib p + "/lib")
                      [ stdenv.cc.libc libunistring libidn2 ]}' \
      "$bin"/bin/*

    cp -r '${libidn2.dev}' "$dev"
    chmod +w "$dev"/nix-support/propagated-build-inputs
    substituteInPlace "$dev"/nix-support/propagated-build-inputs \
      --replace '${libidn2.bin}' "$bin"
    substituteInPlace "$dev"/lib/pkgconfig/libidn2.pc \
      --replace '${libidn2.dev}' "$dev"

    ln -s '${libidn2.out}' "$out" # it's hard to be without any $out
  ''