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# From: https://github.com/NixOS/nixpkgs/pull/139361
{ lib, stdenv, buildPackages, fetchurl, fetchpatch, autoreconfHook, which
, pkg-config, perl, guile, libxml2 }:

stdenv.mkDerivation rec {
  pname = "autogen";
  version = "5.18.16";

  src = fetchurl {
    url = "mirror://gnu/autogen/rel${version}/autogen-${version}.tar.xz";
    sha256 = "16mlbdys8q4ckxlvxyhwkdnh1ay9f6g0cyp1kylkpalgnik398gq";
  };

  patches = let
    dp = { ver ? "1%255.18.16-4", pname, name ? (pname + ".diff"), sha256 }:
      fetchurl {
        url = "https://salsa.debian.org/debian/autogen/-/raw/debian/${ver}"
          + "/debian/patches/${pname}.diff?inline=false";
        inherit name sha256;
      };
  in [
    (dp {
      pname = "20_no_Werror";
      sha256 = "08z4s2ifiqyaacjpd9pzr59w8m4j3548kkaq1bwvp2gjn29m680x";
    })
    (dp {
      pname = "30_ag_macros.m4_syntax_error";
      sha256 = "1z8vmbwbkz3505wd33i2xx91mlf8rwsa7klndq37nw821skxwyh3";
    })
    (dp {
      pname = "31_allow_overriding_AGexe_for_crossbuild";
      sha256 = "0h9wkc9bqb509knh8mymi43hg6n6sxg2lixvjlchcx7z0j7p8xkf";
    })
    # Next upstream release will contain guile-3 support. We apply non-invasive
    # patch meanwhile.
    (fetchpatch {
      name = "guile-3.patch";
      url =
        "https://gitweb.gentoo.org/repo/gentoo.git/plain/sys-devel/autogen/files/autogen-5.18.16-guile-3.patch?id=43bcc61c56a5a7de0eaf806efec7d8c0e4c01ae7";
      sha256 = "18d7y1f6164dm1wlh7rzbacfygiwrmbc35a7qqsbdawpkhydm5lr";
    })
  ];

  outputs = [ "bin" "dev" "lib" "out" "man" "info" ];

  nativeBuildInputs = [
    which
    pkg-config
    perl
    autoreconfHook # patches applied
  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
    # autogen needs a build autogen when cross-compiling
    buildPackages.buildPackages.autogen
    buildPackages.texinfo
  ];
  buildInputs = [ guile libxml2 ];

  preConfigure = ''
    export MAN_PAGE_DATE=$(date '+%Y-%m-%d' -d "@$SOURCE_DATE_EPOCH")
  '';

  configureFlags = [
    # Make sure to use a static value for the timeout. If we do not set a value
    # here autogen will select one based on the execution time of the configure
    # phase which is not really reproducible.
    #
    # If you are curious about the number 78, it has been cargo-culted from
    # Debian: https://salsa.debian.org/debian/autogen/-/blob/master/debian/rules#L21
    "--enable-timeout=78"
  ] ++ (lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
    "--with-libxml2=${libxml2.dev}"
    "--with-libxml2-cflags=-I${libxml2.dev}/include/libxml2"
    # the configure check for regcomp wants to run a host program
    "libopts_cv_with_libregex=yes"
    #"MAKEINFO=${buildPackages.texinfo}/bin/makeinfo"
  ])
  # See: https://sourceforge.net/p/autogen/bugs/187/
    ++ lib.optionals stdenv.isDarwin [ "ac_cv_func_utimensat=no" ];

  #doCheck = true; # not reliable

  postInstall = ''
    mkdir -p $dev/bin
    mv $bin/bin/autoopts-config $dev/bin

    for f in $lib/lib/autogen/tpl-config.tlib $out/share/autogen/tpl-config.tlib; do
      sed -e "s|$dev/include|/no-such-autogen-include-path|" -i $f
      sed -e "s|$bin/bin|/no-such-autogen-bin-path|" -i $f
      sed -e "s|$lib/lib|/no-such-autogen-lib-path|" -i $f
    done

  '' + lib.optionalString (!stdenv.hostPlatform.isDarwin) ''
    # remove /build/** from RPATHs
    for f in "$bin"/bin/*; do
      local nrp="$(patchelf --print-rpath "$f" | sed -E 's@(:|^)/build/[^:]*:@\1@g')"
      patchelf --set-rpath "$nrp" "$f"
    done
  '';

  meta = with lib; {
    description = "Automated text and program generation tool";
    license = with licenses; [ gpl3Plus lgpl3Plus ];
    homepage = "https://www.gnu.org/software/autogen/";
    platforms = platforms.all;
    maintainers = [ ];
  };
}