As reported, see URL: dev-libs/tvision/files/tvision-2.1.0_pre2-gcc6.patch: application/octet-stream; charset=binary (size=5066) Policy reference: https://devmanual.gentoo.org/general-concepts/tree/index.html#what-belongs-in-the-tree%3F
Thanks, fixed in 34828651c9e88bc73478052310ed57b1e9f469bf and 7912f0be85446a42535ba2b4f8f73788e065407e