Gentoo's Bugzilla –
Attachment 833619 Details for
Bug 881983app-antivirus/clamav-0.105.1 fails to compile (CLANG-STRICTER-SYSTEM): qsort.c:66:5: error: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]