diff --git a/acinclude.m4 b/acinclude.m4
index 991d3dae0..1c2d74164 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -533,3 +533,24 @@ AC_MSG_RESULT($ac_cv_struct_winsize)
 AC_EGREP_HEADER(ws_xpixel, termios.h, AC_DEFINE(HAVE_WS_XPIXEL))
 AC_EGREP_HEADER(ws_ypixel, termios.h, AC_DEFINE(HAVE_WS_YPIXEL))
 ])
+
+dnl
+dnl Check for sa_len in sys/socket.h
+dnl
+
+AC_DEFUN(AC_KRB_STRUCT_SOCKADDR_SA_LEN, [
+AC_MSG_CHECKING(for sa_len in struct sockaddr)
+AC_CACHE_VAL(ac_cv_struct_sockaddr_sa_len, [
+AC_TRY_COMPILE(
+[#include <sys/types.h>
+#include <sys/socket.h>],
+[struct sockaddr sa;
+int foo = sa.sa_len;],
+ac_cv_struct_sockaddr_sa_len=yes,
+ac_cv_struct_sockaddr_sa_len=no)
+])
+if test "$ac_cv_struct_sockaddr_sa_len" = yes; then
+	AC_DEFINE(SOCKADDR_HAS_SA_LEN)dnl
+fi
+AC_MSG_RESULT($ac_cv_struct_sockaddr_sa_len)
+])