-AC_CHECK_HEADERS([fcntl.h limits.h sys/ioctl.h syslog.h unistd.h \
-sys/time.h malloc.h strings.h sys/file.h])
+AC_CHECK_HEADERS([fcntl.h inttypes.h limits.h malloc.h stdint.h strings.h syslog.h unistd.h \
+ sys/file.h sys/ioctl.h sys/param.h sys/time.h netinet/in_systm.h])
+AC_CHECK_HEADERS([net/ethernet.h net/if.h netinet/ip.h netinet/tcp.h netinet/ip6.h], [], [],
+ [#include <sys/types.h>
+ #include <sys/socket.h>
+ #ifdef HAVE_NETINET_IN_SYSTM_H
+ #include <netinet/in_systm.h>
+ #endif])