per Sergei's comment ppc/ppc64 is stable, but keyword was missed.
Bug: https://bugs.gentoo.org/607896
Package-Manager: Portage-2.3.28, Repoman-2.3.9
LICENSE="GPL-2"
SLOT="0"
-KEYWORDS="alpha amd64 arm arm64 hppa ia64 ~m68k ~mips ~ppc ppc64 ~s390 ~sh sparc x86 ~amd64-fbsd ~x86-fbsd ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+KEYWORDS="alpha amd64 arm arm64 hppa ia64 ~m68k ~mips ppc ppc64 ~s390 ~sh sparc x86 ~amd64-fbsd ~x86-fbsd ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
IUSE="caps debug python seccomp"
RDEPEND="caps? ( >=sys-libs/libcap-2.24 )