diff --git a/contrib/packaging/pyoxidizer/pyoxidizer.toml b/contrib/packaging/pyoxidizer/pyoxidizer.toml
new file mode 100644
--- /dev/null
+++ b/contrib/packaging/pyoxidizer/pyoxidizer.toml
@@ -0,0 +1,120 @@
+# This file controls the PyOxidizer build configuration. See the
+# pyoxidizer crate's documentation for extensive documentation
+# on this file format.
+
+[[build]]
+application_name = "hg"
+
+[[embedded_python_config]]
+raw_allocator = "jemalloc"
+
+# dont_write_bytecode = true
+# ignore_environment = true
+
+# TODO: enable one or both of these, so that extensions with a separate python
+#       module like mercurial_keyring can load.
+# no_site = true
+# no_user_site_directory = true
+
+
+# optimize_level = 0
+# stdio_encoding = "utf-8:strict"
+
+# Otherwise `hg pull` status is delayed.  No sign of a progress bar either way.
+unbuffered_stdio = true
+# write_modules_directory_env = "PYOXIDIZER_WRITE_MODULES_DIR"
+sys_frozen = true
+# sys_meipass = false
+
+# Windows doesn't support jemalloc.
+[[embedded_python_config]]
+build_target = "i686-pc-windows-msvc"
+raw_allocator = "system"
+
+[[embedded_python_config]]
+build_target = "x86_64-pc-windows-msvc"
+raw_allocator = "system"
+
+[[packaging_rule]]
+type = "stdlib-extensions-policy"
+
+# Package all available extension modules from the Python distribution.
+# The Python interpreter will be fully featured.
+policy = "all"
+
+# Package the entire Python standard library without sources.
+[[packaging_rule]]
+type = "stdlib"
+include_source = false
+
+# Write out license files next to the produced binary.
+[[packaging_rule]]
+type = "write-license-files"
+path = ""
+
+
+# XXX: This doesn't seem to work? (Or at least it still warns about __file__
+#      in these, both when here and if `type = "stdlib"`)
+[[packaging_rule]]
+type = "stdlib-extensions-explicit-excludes"
+excludes = ["setuptools", "pip", "pip._vendor", "distutils", "lib2to3",
+            "unittest" ]
+
+
+# NOTE: in order to successfully bundle the C extensions with this, you must
+# `make -C /path/to/hg/repo clean` and touch this file before *each*
+# `pyoxidizer build`.  This also doesn't currently work on Windows- use
+# `type = "virtualenv"` instead.
+[[packaging_rule]]
+type = "setup-py-install"
+package_path = "/Users/mharbison/mercurial_py3"
+include_source = false
+
+
+[[packaging_rule]]
+type = "pip-install-simple"
+package = "hg-evolve==9.2.1"
+include_source = false
+
+
+# TODO: figure out how to convince it to run the hg script in the repo root.
+[[embedded_python_run]]
+mode = "eval"
+code = "import hgdemandimport; hgdemandimport.enable(); from mercurial import dispatch; dispatch.run()"
+
+
+
+[[distribution]]
+type = "wix"
+
+# END OF COMMON USER-ADJUSTED SETTINGS.
+#
+# Everything below this is typically managed by PyOxidizer and doesn't need
+# to be updated by people.
+
+[[python_distribution]]
+build_target = "i686-pc-windows-msvc"
+url = "https://github.com/indygreg/python-build-standalone/releases/download/20191025/cpython-3.7.5-windows-x86-20191025T0549.tar.zst"
+sha256 = "388d37bcffee183bc23f5fec9c263779c59d298d35c9e4445b407d95f94db19c"
+[[python_distribution]]
+build_target = "x86_64-apple-darwin"
+url = "https://github.com/indygreg/python-build-standalone/releases/download/20191025/cpython-3.7.5-macos-20191026T0535.tar.zst"
+sha256 = "e8d0710627c017213d9c5c6496577539a5adceb56d3060e07954ce9bf59f39ae"
+[[python_distribution]]
+build_target = "x86_64-pc-windows-msvc"
+url = "https://github.com/indygreg/python-build-standalone/releases/download/20191025/cpython-3.7.5-windows-amd64-20191025T0540.tar.zst"
+sha256 = "86a3260edabeed314c6f32a931e60dd097fa854b1346561443353e1bc90e3edd"
+[[python_distribution]]
+build_target = "x86_64-unknown-linux-gnu"
+url = "https://github.com/indygreg/python-build-standalone/releases/download/20191025/cpython-3.7.5-linux64-20191025T0506.tar.zst"
+sha256 = "608871543e6d2cb80e958638e31158355c578c114e12c77765ea5fb996a5a2c2"
+[[python_distribution]]
+build_target = "x86_64-unknown-linux-musl"
+url = "https://github.com/indygreg/python-build-standalone/releases/download/20191025/cpython-3.7.5-linux64-musl-20191026T0603.tar.zst"
+sha256 = "9d46c1964e32f77f22fec96c8acb905e8d4ff54594ca9a2660467f974dca3a53"
+
+
+[[pyoxidizer]]
+version = "0.4.0"
+commit = ""
+