doc/hacking.md: Hint short option make -e

Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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Robert Hensing 2024-01-19 00:32:30 +01:00 committed by GitHub
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@ -115,7 +115,7 @@ You can also build Nix for one of the [supported platforms](#platforms).
You may need `profiledir=$out/etc/profile.d` and `sysconfdir=$out/etc` to run `make install`.
Run `make` with [`--environment-overrides`](https://www.gnu.org/software/make/manual/make.html#index-_002de) to allow environment variables to override `Makefile` variables:
Run `make` with [`-e` / `--environment-overrides`](https://www.gnu.org/software/make/manual/make.html#index-_002de) to allow environment variables to override `Makefile` variables:
- `ENABLE_BUILD=yes` to enable building the C++ code.
- `ENABLE_DOC_GEN=yes` to enable building the documentation (manual, man pages, etc.).