make[1]: Entering directory '/var/tmp/portage/app-emulation/wine-9999/work/wine-9999-abi_x86_32.x86/dlls/mf3216'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/var/tmp/portage/app-emulation/wine-9999/work/wine-9999-abi_x86_32.x86/dlls/mf3216'
STRIPPROG="strip" /var/tmp/portage/app-emulation/wine-9999/work/wine-9999/tools/install-sh dlls/mf3216/mf3216.so /var/tmp/portage/app-emulation/wine-9999/image//usr/lib32/wine/mf3216.so
/var/tmp/portage/app-emulation/wine-9999/work/wine-9999/tools/install-sh: dlls/mf3216/mf3216.so does not exist.
make: *** [Makefile:10219: dlls/mf3216/install-lib] Error 1
If you're using Wine Staging - then the stock Gentoo wine-9999 ebuild can be a bit unreliable with Git master builds. Hence why I forked the app-emulation/wine package in my Overlay (::bobwya surprisingly!!) and did a tonne of work to support building Wine Staging from the Git Master. Even so there can be the odd breakage IMHO. Typically it an happen when you build in the "middle of" Git commit bundles and gets resolved quite quickly.