6085586407
When trying to use Spack to build Intel TBB on the EOS network file
system we use at CERN, I am facing the following error:
```
Launching the installer...
Installation directory is not empty.
The product cannot be installed into nonempty directory
'/eos/home-s/sswatman/spack/opt/spack/linux-x86_64_v2/...
intel-oneapi-tbb-2021.12.0-3jlx6hlr3z6di42f3qy35eizcse7u2tk'.
```
This error appears to happen because Spack tries to set `$HOME` to the
prefix of the package, into which the Intel installer is also trying to
install it's software. I've found that an easy fix is to set `$HOME` to
a directory in the build stage instead, as this can be guaranteed to
remain empty.
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