The glossaries-package depends on dev-tex/xkeyval, which can't be used with texlive. However, glossaries can use dev-texlive/texlive-latexrecommended which provides xkeyval. I changed the ebuild and it works fine for me. Reproducible: Always Steps to Reproduce:
Created attachment 143781 [details, diff] glossaries-texlive.patch
applied, thanks a lot !