I have tested games-emulation/advancemame-3.9 on ppc64 and it works
Looking good on ppc64. Failed builds are due to parralel build (-j16) issues. With MAKEOPTS="-j1" these builds succeed (bug #775107). # cat advancemame-769962.report USE tests started on Di 9. Mär 15:00:58 CET 2021 FEATURES=' test' failed for =games-emulation/advancemame-3.9 USE='alsa -fbcon ncurses -oss -slang -truetype' failed for =games-emulation/advancemame-3.9 USE='alsa fbcon -ncurses oss -slang -truetype' failed for =games-emulation/advancemame-3.9 USE='alsa fbcon -ncurses -oss -slang truetype' failed for =games-emulation/advancemame-3.9 USE='-alsa -fbcon ncurses -oss -slang truetype' succeeded for =games-emulation/advancemame-3.9 USE='-alsa fbcon ncurses -oss -slang truetype' failed for =games-emulation/advancemame-3.9 USE='alsa fbcon -ncurses oss -slang truetype' failed for =games-emulation/advancemame-3.9 USE='alsa -fbcon ncurses oss -slang truetype' failed for =games-emulation/advancemame-3.9 USE='alsa -fbcon -ncurses -oss slang truetype' failed for =games-emulation/advancemame-3.9 USE='alsa fbcon -ncurses -oss slang truetype' failed for =games-emulation/advancemame-3.9 USE='-alsa fbcon -ncurses oss slang truetype' failed for =games-emulation/advancemame-3.9 USE='-alsa -fbcon ncurses oss slang truetype' succeeded for =games-emulation/advancemame-3.9 USE='alsa fbcon ncurses oss slang truetype' succeeded for =games-emulation/advancemame-3.9
ppc64 done all arches done