The eclass contains this block: dosym vim.1.gz /usr/share/man/man1/gvim.1.gz dosym vim.1.gz /usr/share/man/man1/gview.1.gz dosym vimdiff.1.gz /usr/share/man/man1/gvimdiff.1.gz but it is unlikely that vim.1.gz and vimdiff.1.gz exist. Portage’s default is to use bzip2. Some of us use xz. (Is it PORTAGE_COMPRESS which controls the compression for man pages?) The eclass needs to set the symlink based on what is actually installed by app-editors/vim.
*** This bug has been marked as a duplicate of bug 455480 ***