Patch-Source: https://github.com/archlinux/svntogit-community/blob/253ab7a3729e/trunk/python-pdm-pep517-1.0.5-devendor.patch

amended to work with packaging 22.0

diff -ruN a/pdm/pep517/base.py b/pdm/pep517/base.py
diff --git a/pdm/pep517/base.py b/pdm/pep517/base.py
index 718f651..c70e5d1 100644
--- a/pdm/pep517/base.py
+++ b/pdm/pep517/base.py
@@ -7,7 +7,7 @@ import warnings
 from pathlib import Path
 from typing import Any, Iterator, Mapping, TypeVar, cast
 
-from pdm.pep517._vendor import tomli
+import tomli
 from pdm.pep517.exceptions import MetadataError, PDMWarning, ProjectError
 from pdm.pep517.metadata import Metadata
 from pdm.pep517.utils import is_python_package, safe_version, to_filename
diff --git a/pdm/pep517/license.py b/pdm/pep517/license.py
index bccd58f..efabeca 100644
--- a/pdm/pep517/license.py
+++ b/pdm/pep517/license.py
@@ -1,6 +1,6 @@
 import warnings
 
-from pdm.pep517._vendor.license_expression import (
+from license_expression import (
     LicenseSymbol,
     Licensing,
     get_spdx_licensing,
diff --git a/pdm/pep517/metadata.py b/pdm/pep517/metadata.py
index 566ff45..0c32d20 100644
--- a/pdm/pep517/metadata.py
+++ b/pdm/pep517/metadata.py
@@ -5,7 +5,7 @@ import os
 from pathlib import Path
 from typing import Any, Callable, Generic, Iterable, Mapping, TypeVar, cast
 
-from pdm.pep517._vendor.packaging.requirements import InvalidRequirement, Requirement
+from packaging.requirements import InvalidRequirement, Requirement
 from pdm.pep517.exceptions import MetadataError, PDMWarning, ProjectError
 from pdm.pep517.utils import (
     cd,
diff --git a/pdm/pep517/scm.py b/pdm/pep517/scm.py
index f283c68..ec66683 100644
--- a/pdm/pep517/scm.py
+++ b/pdm/pep517/scm.py
@@ -14,8 +14,8 @@ from datetime import datetime
 from pathlib import Path
 from typing import Any, Iterable, NamedTuple
 
-from pdm.pep517._vendor.packaging.version import LegacyVersion, Version
-from pdm.pep517._vendor.packaging.version import parse as parse_version
+from packaging.version import Version
+from packaging.version import parse as parse_version
 
 DEFAULT_TAG_REGEX = re.compile(
     r"^(?:[\w-]+-)?(?P<version>[vV]?\d+(?:\.\d+){0,2}[^\+]*)(?:\+.*)?$"
@@ -53,7 +53,7 @@ def _subprocess_call(
 
 
 class VersionInfo(NamedTuple):
-    version: Version | LegacyVersion
+    version: Version
     distance: int | None
     dirty: bool
     node: str | None
@@ -61,7 +61,7 @@ class VersionInfo(NamedTuple):
 
 
 def meta(
-    tag: str | Version | LegacyVersion,
+    tag: str | Version,
     distance: int | None = None,
     dirty: bool = False,
     node: str | None = None,
@@ -136,7 +136,7 @@ def _parse_version_tag(tag: str) -> _ParseResult | None:
     return result
 
 
-def tag_to_version(tag: str) -> Version | LegacyVersion:
+def tag_to_version(tag: str) -> Version:
     """
     take a tag that might be prefixed with a keyword and return only the version part
     :param config: optional configuration object
@@ -154,7 +154,7 @@ def tag_to_version(tag: str) -> Version | LegacyVersion:
     return parse_version(version)
 
 
-def tags_to_versions(tags: Iterable[str]) -> list[Version | LegacyVersion]:
+def tags_to_versions(tags: Iterable[str]) -> list[Version]:
     """
     take tags that might be prefixed with a keyword and return only the version part
     :param tags: an iterable of tags
@@ -241,7 +241,7 @@ def _hg_tagdist_normalize_tagcommit(
         return meta(tag)
 
 
-def guess_next_version(tag_version: Version | LegacyVersion) -> str:
+def guess_next_version(tag_version: Version) -> str:
     version = _strip_local(str(tag_version))
     return _bump_dev(version) or _bump_regex(version)
 
diff --git a/pdm/pep517/sdist.py b/pdm/pep517/sdist.py
index 3b440ec..7abcced 100644
--- a/pdm/pep517/sdist.py
+++ b/pdm/pep517/sdist.py
@@ -6,7 +6,8 @@ import tempfile
 from copy import copy
 from typing import Any, Iterator
 
-from pdm.pep517._vendor import tomli, tomli_w
+import tomli
+import tomli_w
 from pdm.pep517.base import Builder
 
 
diff --git a/pdm/pep517/utils.py b/pdm/pep517/utils.py
index 7517ebb..7f5447b 100644
--- a/pdm/pep517/utils.py
+++ b/pdm/pep517/utils.py
@@ -12,10 +12,10 @@ from fnmatch import fnmatchcase
 from pathlib import Path
 from typing import Callable, Generator, Iterable, Match
 
-from pdm.pep517._vendor.packaging import tags
-from pdm.pep517._vendor.packaging.markers import Marker
-from pdm.pep517._vendor.packaging.requirements import Requirement
-from pdm.pep517._vendor.packaging.version import InvalidVersion, Version
+from packaging import tags
+from packaging.markers import Marker
+from packaging.requirements import Requirement
+from packaging.version import InvalidVersion, Version
 from pdm.pep517.macosx_platform import calculate_macosx_platform_tag
 
 
diff --git a/pdm/pep517/validator.py b/pdm/pep517/validator.py
index b9fc7aa..3852be1 100644
--- a/pdm/pep517/validator.py
+++ b/pdm/pep517/validator.py
@@ -1,6 +1,6 @@
 from typing import Mapping
 
-from pdm.pep517._vendor import cerberus
+import cerberus
 from pdm.pep517.exceptions import PEP621ValidationError
 
 README_RULE = [
diff --git a/pdm/pep517/wheel.py b/pdm/pep517/wheel.py
index c47cbca..1a6303f 100644
--- a/pdm/pep517/wheel.py
+++ b/pdm/pep517/wheel.py
@@ -19,8 +19,8 @@ from pathlib import Path
 from typing import Any, BinaryIO, Generator, Mapping, NamedTuple, TextIO
 
 from pdm.pep517 import __version__
-from pdm.pep517._vendor.packaging import tags
-from pdm.pep517._vendor.packaging.specifiers import SpecifierSet
+from packaging import tags
+from packaging.specifiers import SpecifierSet
 from pdm.pep517.base import Builder
 from pdm.pep517.exceptions import BuildError, PDMWarning
 from pdm.pep517.utils import get_abi_tag, get_platform, show_warning
diff --git a/tests/test_metadata.py b/tests/test_metadata.py
index c9c318e..1116ad7 100644
--- a/tests/test_metadata.py
+++ b/tests/test_metadata.py
@@ -5,7 +5,7 @@ from typing import Optional
 
 import pytest
 
-from pdm.pep517._vendor import tomli
+import tomli
 from pdm.pep517.metadata import Metadata
 from tests import FIXTURES