ref: a4f5892f3b4aa79446f85e4b60f01564a1f18a9c dir: /src/runtime/config-unix-32.h/
#include "config-unix-64.h" //#undef WORD_SIZE //#define WORD_SIZE 32 #undef FFS #if _POSIX_VERSION >= 200112L #define FFS ffs #endif