lddtreeing some program, I discover that I get a circular dependency :
libharfbuzz.so.0 => /usr/lib64/libharfbuzz.so.0
libfreetype.so.6 => /usr/lib64/libfreetype.so.6
libharfbuzz.so.0 => !!! circular loop !!!
Ok, this is a known problem well documented ( https://wiki.gentoo.org/wiki/User:Sam/Portage_help/Circular_dependencies ) being solved rebuilding freetype USE=-harfbuzz
The problem I report here is that if I want to rebuild harfbuzz having freetype installed USE = +harfbuzz, emerge will work happily without reporting any error such as shown in the wikipage linked hereabove.
Created attachment 824677 [details]
For a start, please use a non-masked Portage.