+# check for netdb.h
+dnl Check for netdb.h
+AC_CHECK_HEADERS([netdb.h])
+
+# check for utime.h
+dnl Check for utime.h
+AC_CHECK_HEADERS([utime.h])
+
+# check for net/if.h
+dnl Check for net/if.h
+AC_CHECK_HEADERS([net/if.h])
+
+# check for sys/time.h
+dnl Check for sys/time.h
+AC_CHECK_HEADERS([sys/time.h])
+