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add clarity for custom path installation #131001

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Oct 6, 2024
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add clarity for custom path installation #131001

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20 changes: 17 additions & 3 deletions INSTALL.md
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Expand Up @@ -79,9 +79,23 @@ See [the rustc-dev-guide for more info][sysllvm].
./configure
```

If you plan to use `x.py install` to create an installation, it is
recommended that you set the `prefix` value in the `[install]` section to a
directory: `./configure --set install.prefix=<path>`
If you plan to use `x.py install` to create an installation, you can either
set `DESTDIR` environment variable to your custom directory path:

```bash
export DESTDIR=<path>
```

or set `prefix` and `sysconfdir` in the `[install]` section to your custom
directory path:

```sh
./configure --set install.prefix=<path> --set install.sysconfdir=<path>
```

When the `DESTDIR` environment variable is present, the `prefix` and
`sysconfdir` values are combined with the path from the `DESTDIR`
environment variable.

3. Build and install:

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