blt-2.4z-r13 fails the compilation, and in the logs you may notice asking whether to overwrite or not /var/tmp/portage/dev-tcltk/blt-2.4z-r13/image/usr/share/doc/blt-2.4z-r13/README
Also manually deleting /var/tmp/portage and trying to compile again, the situation does not change.
Created attachment 557556 [details]
Created attachment 557558 [details]
The error show up during the merge phase.
Need to involve the portage team
This is triggered with PORTAGE_COMPRESS="lz4".
(In reply to Zac Medico from comment #4)
> This is triggered with PORTAGE_COMPRESS="lz4".
Yes, without compressing with lz4 the software is compiled.