18367 /usr/share/doc/gstreamermm-0.10 [ Searching for packages matching gstreamermm... ] * size of dev-cpp/gstreamermm-0.10.6 Total files : 1002 Total size : 22432.72 KiB Reproducible: Always
man 5 make.conf -> FEATURES="nodoc" USE="doc" controls doc generation deps, not docs itself
Please request upstream to split documentation out of the release tarball if you find it excessive.