Just for context as to how I got to the `PYTHON3` variable: one of your errors "[config/rules.mk:851: misc Error 101](https://searchfox.org/mozilla-central/source/config/rules.mk#851)" calls `py_action` and that maps to [here](https://searchfox.org/mozilla-central/source/config/makefiles/functions.mk#30).
Bug 1767299 Comment 6 Edit History
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Just for context as to how I got to the `PYTHON3` variable: one of your errors "[config/rules.mk:851: misc Error 101](https://searchfox.org/mozilla-central/source/config/rules.mk#851)" calls `py_action` and that maps to [here](https://searchfox.org/mozilla-central/source/config/makefiles/functions.mk#30), which comes back to [here](https://searchfox.org/mozilla-central/source/build/moz.configure/init.configure#133-151) from the last comment.
Just for context as to how I got to the `PYTHON3` variable: one of your errors "[config/rules.mk:851: misc Error 101](https://searchfox.org/mozilla-central/source/config/rules.mk#851)" calls `py_action` and that maps to [here](https://searchfox.org/mozilla-central/source/config/makefiles/functions.mk#30), which comes back to [here](https://searchfox.org/mozilla-central/source/build/moz.configure/init.configure#133-151) from the previous comment.