I have noticed that =media-gfx/nomacs-3.6.1 require dev-qt/qtimageformats in order to be able of open .tiff files. Even if compiled with +tiff use flag I was not able to see tiff images, but as soon I have emerged qtimageformats it started to work fine.
I can confirm that without dev-qt/qtimageformats-5.7.1 the "media-gfx/nomacs" doesn't able to open *.tif files. Also media-gfx/gwenview lost "TIFF" support after deleting of the "qtimageformats" that is in dependence of gwenview. In case of gwenview such dependence installs automatically.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=9677964baab97edb18a9b2d6422d707e9b89c5d5 commit 9677964baab97edb18a9b2d6422d707e9b89c5d5 Author: Michael Palimaka <kensington@gentoo.org> AuthorDate: 2017-09-13 12:20:06 +0000 Commit: Michael Palimaka <kensington@gentoo.org> CommitDate: 2017-09-13 12:20:25 +0000 media-gfx/nomacs: add missing dependency required to view tiff files Closes: https://bugs.gentoo.org/630764 Package-Manager: Portage-2.3.6, Repoman-2.3.3 media-gfx/nomacs/nomacs-3.6.1-r1.ebuild | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/sync/gentoo.git/commit/?id=9677964baab97edb18a9b2d6422d707e9b89c5d5 commit 9677964baab97edb18a9b2d6422d707e9b89c5d5 Author: Michael Palimaka <kensington@gentoo.org> AuthorDate: 2017-09-13 12:20:06 +0000 Commit: Michael Palimaka <kensington@gentoo.org> CommitDate: 2017-09-13 12:20:25 +0000 media-gfx/nomacs: add missing dependency required to view tiff files Closes: https://bugs.gentoo.org/630764 Package-Manager: Portage-2.3.6, Repoman-2.3.3 media-gfx/nomacs/nomacs-3.6.1-r1.ebuild | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)