x11-libs/libXaw3dXft has USE=xpm which adds support for multiplane-bitmaps I think x11-libs/libXaw3d should too(tested that --enable-multiplane-bitmaps builds and works with emacs)
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=a1d998b88ecbd6726b574e5df711779c964f5769 commit a1d998b88ecbd6726b574e5df711779c964f5769 Author: Matt Turner <mattst88@gentoo.org> AuthorDate: 2018-06-19 05:03:51 +0000 Commit: Matt Turner <mattst88@gentoo.org> CommitDate: 2018-06-19 05:07:53 +0000 x11-libs/libXaw3d: Version bump 1.6.3 Also add xpm USE flag. Closes: https://bugs.gentoo.org/636766 x11-libs/libXaw3d/Manifest | 1 + x11-libs/libXaw3d/libXaw3d-1.6.3.ebuild | 30 ++++++++++++++++++++++++++++++ 2 files changed, 31 insertions(+)