Today I wanted to install nethack and found it is masked: The following mask changes are necessary to proceed: #required by nethack (argument) # /usr/portage/profiles/package.mask: # Tavis Ormandy (21 Mar 2006) # masked pending unresolved security issues #125902 =games-roguelike/nethack-3.4.3-r1 Then I googled and view https://bugs.gentoo.org/show_bug.cgi?id=125902#c82. It turned out the bug has been existed for more than six years and is related to gentoo's group game policy. So can I just manually install nethack as a common user ?