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doc: minimize mentions of nix-env -i without -A in nixpkgs manual

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Guillaume Girol 2021-11-08 12:00:00 +00:00
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doc/languages-frameworks/emscripten.section.md
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@ -15,12 +15,12 @@ Modes of use of `emscripten`:
If you want to work with `emcc`, `emconfigure` and `emmake` as you are used to from Ubuntu and similar distributions you can use these commands:
* `nix-env -i emscripten`
* `nix-env -f "<nixpkgs>" -iA emscripten`
* `nix-shell -p emscripten`
* **Declarative usage**:
This mode is far more power full since this makes use of `nix` for dependency management of emscripten libraries and targets by using the `mkDerivation` which is implemented by `pkgs.emscriptenStdenv` and `pkgs.buildEmscriptenPackage`. The source for the packages is in `pkgs/top-level/emscripten-packages.nix` and the abstraction behind it in `pkgs/development/em-modules/generic/default.nix`.
This mode is far more power full since this makes use of `nix` for dependency management of emscripten libraries and targets by using the `mkDerivation` which is implemented by `pkgs.emscriptenStdenv` and `pkgs.buildEmscriptenPackage`. The source for the packages is in `pkgs/top-level/emscripten-packages.nix` and the abstraction behind it in `pkgs/development/em-modules/generic/default.nix`. From the root of the nixpkgs repository:
* build and install all packages:
* `nix-env -iA emscriptenPackages`