diff --git a/cf/krb-irix.m4 b/cf/krb-irix.m4
new file mode 100644
index 000000000..88cb4cb66
--- /dev/null
+++ b/cf/krb-irix.m4
@@ -0,0 +1,11 @@
+dnl
+dnl $Id$
+dnl
+
+dnl requires AC_CANONICAL_HOST
+AC_DEFUN(KRB_IRIX,[
+case "$host_os" in
+irix*) irix=yes ;;
+esac
+AM_CONDITIONAL(IRIX, test "$irix" != no)dnl
+])