diff -ur a/osdep.m4 b/osdep.m4
--- a/osdep.m4	2024-11-20 08:07:22.000000000 +1100
+++ b/osdep.m4	2024-12-16 20:39:15.424935602 +1100
@@ -381,6 +381,7 @@
 unset have_sa_len
 AC_MSG_CHECKING([for sa_len in sockaddr])
 AC_TRY_COMPILE([
+#include <stdint.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 ], [struct sockaddr sa;
@@ -397,6 +398,7 @@
    unset sa_len_type_found
    for type in uint8_t "unsigned char"; do
        AC_TRY_COMPILE([
+#include <stdint.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <stdio.h>], [
@@ -640,6 +642,7 @@
 		in_port_t, in_addr_t],
 		, ,
 [
+#include <stdint.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 ])