cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration poll/ppoll.c -o poll/ppoll -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
poll/ppoll.c:50:14: error: call to undeclared function 'ppoll'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   50 |         if ( (ret = ppoll(pfds, 1, &timeout, &oldset)) < 0 )
      |                     ^
poll/ppoll.c:50:14: note: did you mean 'poll'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/poll.h:113:12: note: 'poll' declared here
  113 | extern int poll(struct pollfd *, nfds_t, int) __DARWIN_ALIAS_C(poll);
      |            ^
1 error generated.