asciidoctor-pdf only supports up to ruby 3.0 but that was masked for removal on 2023-08-19 (see URL).
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/proj/guru.git/commit/?id=180ed21f8972c80f4b46ba43c1244b0eb4e8959e commit 180ed21f8972c80f4b46ba43c1244b0eb4e8959e Author: Huang Rui <vowstar@gmail.com> AuthorDate: 2023-08-24 08:55:09 +0000 Commit: Huang Rui <vowstar@gmail.com> CommitDate: 2023-08-24 08:55:17 +0000 dev-ruby/asciidoctor-pdf: enable ruby31 Closes: https://bugs.gentoo.org/912941 Signed-off-by: Huang Rui <vowstar@gmail.com> dev-ruby/asciidoctor-pdf/asciidoctor-pdf-2.3.4.ebuild | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)