The default support should be OpenFirmware, requiring pc-style
support directly fail on configure.
# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
+# Luca Barbato <lu_zero@gentoo.org> (12 Aug 2018)
+# Default to PowerPC OpenFirmware
+sys-boot/grub:2 grub_platforms_ieee1275
+
# Doug Goldstein <cardoe@gentoo.org> (29 Oct 2012)
# Enable the native arch as the default qemu target
app-emulation/qemu qemu_softmmu_targets_ppc
# Copyright 1999-2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
+# Luca Barbato <lu_zero@gentoo.org> (12 Aug 2018)
+# grub pc is not supported on powerpc
+sys-boot/grub:2 grub_platforms_pc grub_platforms_efi-32 grub_platforms_efi-64 grub_platforms_xen
+
# Pacho Ramos <pacho@gentoo.org> (27 May 2018)
# kde-frameworks/kdelibs4support not keyworded on ppc
# Michał Górny <mgorny@gentoo.org> (09 Jul 2018)