Gentoo's Bugzilla –
Attachment 842761 Details for
Bug 886067sci-calculators/tiemu-3.03-r1 fails to compile (CLANG-STRICTER-SYSTEM): newcpu.c:299:13: error: call to undeclared function romcalls_is_addr; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]