check_c_source_compiles("
#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
int
main(int argc, char *argv[])
{
	int fd = 0, rv;
	struct linger ling;
	socklen_t lingLen = sizeof(ling);
	ling.l_onoff = 1; ling.l_linger = 1;
	rv = setsockopt(fd, SOL_SOCKET, SO_LINGER, &ling, lingLen);
	return (rv != 0);
}
" HAVE_SO_LINGER)