Gentoo's Bugzilla –
Attachment 833627 Details for
Bug 881991app-arch/gzip-1.12-r2 fails to compile (CLANG-STRICTER-SYSTEM): bits.c:112:6: error: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]