Gentoo's Bugzilla –
Attachment 833931 Details for
Bug 882089app-cdr/xbiso-0.6.1-r3 fails to compile (CLANG-STRICTER-SYSTEM): xbiso.c:256:3: error: call to undeclared function handlefile; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]