It seems a dep is missing: # emerge ambertools * IMPORTANT: 1 news items need reading for repository 'gentoo'. * Use eselect news read to view new items. Calculating dependencies... done! emerge: there are no ebuilds to satisfy "sci-chemistry/reduce". (dependency required by "sci-chemistry/ambertools-15_p6::science" [ebuild]) (dependency required by "ambertools" [argument])
commit 3f82bedc598954b453b33eda83de53c47dd30ed0 Author: Aisha Tammy <gentoo@aisha.cc> Date: Sat Sep 26 16:20:34 2020 +0000 sci-chemistry/ambertools: drop dead package