pollution: dirp
int dirfd(DIR *dirp) __attribute__((availability(macosx,introduced=10.8))); 

pollution: scandir_b
int scandir_b(const char *, struct dirent ***, int (^)(const struct dirent *) __attribute__((__noescape__)), int (^)(const struct dirent **, const struct dirent **) __attribute__((__noescape__))) __asm("_" "scandir_b" ) __attribute__((availability(macosx,introduced=10.6)));