The scons flag is called "qt", not "libQgpsmm". Will provide a PR shortly.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=64b3191d12885b12923680de6f943476cad70a2f commit 64b3191d12885b12923680de6f943476cad70a2f Author: Rolf Eike Beer <eike@sf-mail.de> AuthorDate: 2018-08-12 17:43:32 +0000 Commit: Andreas Sturmlechner <asturm@gentoo.org> CommitDate: 2018-09-04 20:49:17 +0000 sci-geosciences/gpsd: fix USE=qt5, add USE=cxx Closes: https://bugs.gentoo.org/663458 Closes: https://github.com/gentoo/gentoo/pull/9551 sci-geosciences/gpsd/gpsd-3.17-r3.ebuild | 168 +++++++++++++++++++++++++++++++ sci-geosciences/gpsd/gpsd-9999.ebuild | 9 +- 2 files changed, 173 insertions(+), 4 deletions(-)