When Pod-Simple is in PERL_CORE we can build with a readonly source directory #175
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Because Cwd::abs_path resolves symlinks, it means if we are in PERL_CORE and building perl outside of the source directory, whle the main source directory is readonly, some of the tests fail because they can't write to the source directory when they should be writing to the build directory, or ideally to a tmpdir.
https://github.com/Perl/perl5/blob/blead/INSTALL#building-perl-outside-of-the-source-directory
We use this feature in OpenBSD.