_mkflags_ had an issue for generating FLAG_xxxx macros for long options. Only the first __long__ option, without any __short__ option had a proper flag value, rest all were defined to ZERO. Becaus the _flist_ was not moved to the next in this case.

#include "toys.h"

int xsocket(int domain, int type, int protocol)
{
  int fd = socket(domain, type, protocol);

  if (fd < 0) perror_exit("socket %x %x", type, protocol);
  return fd;
}