Update is pulling in media-gfx/fontforge-20190317-r2. Appears to need useflag `cairo` enabled. Adding `>=media-gfx/fontforge-20190317-r2 cairo` to my /etc/portage package.use file seems to resolve the issue. I don't know if these needs to be added to the portage package defaults or not. Just thought I'd report it.
# emerge world -uDNav --with-bdeps yThese are the packages that would be merged, in order:Calculating dependencies... done!!!! The ebuild selected to satisfy "media-gfx/fontforge" has unmet requirements. - media-gfx/fontforge-20190317-r2::media-kit USE="X gif gtk jpeg png python readline svg tiff unicode -cairo -test -truetype-debugger" PYTHON_SINGLE_TARGET="python3_6 -python2_7 -python3_5 -python3_7" PYTHON_TARGETS="python2_7 python3_6 -python3_5 -python3_7" The following REQUIRED_USE flag constraints are unsatisfied: gtk? ( cairo ) The above constraints are a subset of the following complete expression: cairo? ( png ) gtk? ( cairo ) python? ( exactly-one-of ( python_single_target_python2_7 python_single_target_python3_5 python_single_target_python3_6 python_single_target_python3_7 ) python_single_target_python2_7? ( python_targets_python2_7 ) python_single_target_python3_5? ( python_targets_python3_5 ) python_single_target_python3_6? ( python_targets_python3_6 ) python_single_target_python3_7? ( python_targets_python3_7 ) ) test? ( png python )(dependency required by "app-office/libreoffice-6.2.4.2-r2::desktop-kit" [ebuild]) (dependency required by "@selected" [set]) (dependency required by "@world" [argument])