Index: autogen.sh
==================================================================
--- autogen.sh
+++ autogen.sh
@@ -1,4 +1,13 @@
 #!/bin/sh
-aclocal -I m4 || exit 1
-autoconf || exit 1
-autoheader || exit 1
+set -e
+
+# Set a version for OpenBSD
+if test x"$(uname -s)" = x"OpenBSD"; then
+	: ${AUTOCONF_VERSION:=2.71}
+	: ${AUTOMAKE_VERSION:=1.16}
+	export AUTOCONF_VERSION AUTOMAKE_VERSION
+fi
+
+aclocal -I build-aux/m4
+autoconf
+autoheader