diff --git a/docs/conf.py b/docs/conf.py
index ebdd217a..46caa97c 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -40,6 +40,7 @@
 
 intersphinx_mapping = {
     'python': ('https://docs.python.org/3/', None),
+    'packaging': ('https://packaging.python.org/en/latest/', None),
 }
 
 # Add any paths that contain templates here, relative to this directory.
diff --git a/docs/index.rst b/docs/index.rst
index ac222f39..1ce74d96 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -4,10 +4,11 @@
 build
 *****
 
-A simple, correct Python packaging build frontend.
+A simple, correct Python packaging :std:term:`build frontend <Build Frontend>`.
 
 build manages ``pyproject.toml``-based builds, invoking
-build-backend hooks as appropriate to build a distribution package.
+:std:term:`build-backend <Build Backend>` hooks as appropriate to build a
+:std:term:`distribution package <Distribution Package>`.
 It is a simple build tool and does not perform any dependency management.
 
 .. sphinx_argparse_cli::
diff --git a/src/build/_types.py b/src/build/_types.py
index ac363581..8d7bdd8a 100644
--- a/src/build/_types.py
+++ b/src/build/_types.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import os
+import sys
 import typing
 
 
@@ -8,7 +9,11 @@
 
 ConfigSettings = typing.Mapping[str, typing.Union[str, typing.Sequence[str]]]
 Distribution = typing.Literal['sdist', 'wheel', 'editable']
-StrPath = typing.Union[str, 'os.PathLike[str]']
+
+if typing.TYPE_CHECKING or sys.version_info > (3, 9):
+    StrPath = typing.Union[str, os.PathLike[str]]
+else:
+    StrPath = typing.Union[str, os.PathLike]
 
 if typing.TYPE_CHECKING:
     from pyproject_hooks import SubprocessRunner