[ruby-core:103088] [Ruby master Feature#17760] Where we should install a header file when `gem install --user`?

Issue #17760 has been reported by mrkn (Kenta Murata).

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Feature #17760: Where we should install a header file when `gem install --user`?
https://bugs.ruby-lang.org/issues/17760

* Author: mrkn (Kenta Murata)
* Status: Open
* Priority: Normal
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As `digest` have been made a default gem at Ruby 3.0,  it can be installed by `gem install` command.

When we install `digest`, `digest.h` is installed at the same directory as `ruby.h`.  But when we use `gem install --user` for installing it, where should `digest.h` is installed in?

Now, the location of `digest.h` is always the same directory as `ruby.h` regardless of whether we use `gem install --user`.  It occurs permission error when non-root user uses `gem install --user` for installing `digest` on the system-ruby.



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