"Implicit function error" build failure(s) — clang 3.9.1

PackageVersionSupposed error messageFull log Bug report
collectd 5.7.1-1.1rte_memcpy.h:814:2: error: implicit declaration of function '_mm_alignr_epi8' is invalid in C99 [-Werror,-Wimplicit-function-declaration] Log 758481
freetype 2.8-0.2ttdebug.c:1935:16: error: implicitly declaring library function 'snprintf' with type 'int (char *, unsigned long, const char *, ...)' [-Werror,-Wimplicit-function-declaration] Log
smpq 1.6-1extract.c:73:16: error: implicit declaration of function 'strdup' [-Werror,-Wimplicit-function-declaration] Log

3 errors