forked from lix-project/lix
Merge pull request #5365 from arafangion/master
Clarify that not all nix packages will use the default build phases
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@ -110,13 +110,19 @@ shell in which to build it:
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```console
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$ nix-shell '<nixpkgs>' -A pan
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[nix-shell]$ unpackPhase
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[nix-shell]$ eval ${unpackPhase:-unpackPhase}
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[nix-shell]$ cd pan-*
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[nix-shell]$ configurePhase
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[nix-shell]$ buildPhase
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[nix-shell]$ eval ${configurePhase:-configurePhase}
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[nix-shell]$ eval ${buildPhase:-buildPhase}
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[nix-shell]$ ./pan/gui/pan
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```
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The reason we use form `eval ${configurePhase:-configurePhase}` here is because
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those packages that override these phases do so by exporting the overridden
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values in the environment variable of the same name.
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Here bash is being told to either evaluate the contents of 'configurePhase',
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if it exists as a variable, otherwise evaluate the configurePhase function.
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To clear the environment first, and do some additional automatic
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initialisation of the interactive shell:
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