--- configure.ac.orig	2014-02-19 15:47:17.000000000 +0000
+++ configure.ac	2017-08-24 11:30:00.000000000 +0000
@@ -5,6 +5,7 @@
 
 # Checks for programs:
 
+AM_PROG_AR
 AC_PROG_CXX
 AC_LIBTOOL_DLOPEN
 AC_PROG_LIBTOOL