On 2021-04-20 15:40+0100 Peter Humphrey <[email protected]> wrote:

> Hello list,
> 
> Has anyone here succeeded in building a new system since the recent
> Ruby language upgrade? I keep being thwarted by failure such as this
> typical one:
> 
> >>> Install dev-ruby/rake-13.0.3-r1 into /var/tmp/portage/dev-ruby/  
> rake-13.0.3-r1/image
>  * Running install phase for ruby26 ...
>  * Running install phase for ruby27 ...
> Traceback (most recent call last):
>         3: from <internal:gem_prelude>:1:in `<internal:gem_prelude>'
>         2: from <internal:gem_prelude>:1:in `require'
>         1: from /usr/lib64/ruby/2.7.0/rubygems.rb:16:in `<top
> (required)>' /usr/lib64/ruby/2.7.0/rubygems.rb:16:in `require':
> cannot load such file -- rubygems/compatibility (LoadError)
>  * ERROR: dev-ruby/rake-13.0.3-r1::gentoo failed (install phase):
>  *   Unable to generate gemspec file.
> 
> Similar failures occur whatever profile I use (of the suitable ones),
> and no matter whether I set amd64 or ~amd64 in make.conf.
> 
> It's possible that I had some unhelpful USE flags set, I suppose, but
> I did try to minimise them.
> 
> In the end I went back to a month-old backup and updated that instead.
> 

That looks like you need to select the new ruby version with eselect.
It doesn't figure out the right version automatically, like python.
See also:
<https://archives.gentoo.org/gentoo-user/message/e7203a5fe084ab6f35351a814de3f6db>.

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