Created attachment 404184 [details] config.log output with USE='-gtk gtk3'. See "configure:32149: WARNING: uim-pref needs Gtk+ or Qt toolkit, disabled..." configure script of uim package has '--enable-default-toolkit' option, and its default value is 'gtk'. It does not properly set if '--without-gtk2' option is given. For example, it does not set to 'gtk3' automatically when user specify only 'gtk3' USE flag. It causes "Pref : no" (and maybe some other side effects) on configure result, and uim-perf-gtk3 or uim-perf-qt4 does not built, at least.
Created attachment 404186 [details] patched ebuild. I'll attach working ebuild file using portage overlay. It sets --enable-default-toolkit option properly on myconf variable before running econf.
Created attachment 404188 [details, diff] patch file.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=e4774cff8971e892558198e043d8c9c7211fc594 commit e4774cff8971e892558198e043d8c9c7211fc594 Author: Akinori Hattori <hattya@gentoo.org> AuthorDate: 2018-05-28 14:32:34 +0000 Commit: Akinori Hattori <hattya@gentoo.org> CommitDate: 2018-05-28 14:55:58 +0000 app-i18n/uim: specify default toolkit Closes: https://bugs.gentoo.org/550662 Package-Manager: Portage-2.3.24, Repoman-2.3.6 app-i18n/uim/uim-1.8.6-r1.ebuild | 1 + app-i18n/uim/uim-1.8.6-r2.ebuild | 1 + 2 files changed, 2 insertions(+)