diff -Naur wmbiff-0.4.36.orig/configure.ac wmbiff-0.4.36/configure.ac
--- wmbiff-0.4.36.orig/configure.ac	2020-04-17 19:30:26.000000000 +0200
+++ wmbiff-0.4.36/configure.ac	2021-01-03 00:27:57.522698494 +0100
@@ -13,6 +13,7 @@
 AH_TEMPLATE([VERSION], [wmbiff's release version])
 AC_SUBST(VERSION)
 
+AM_PROG_AR
 AC_PROG_INSTALL
 AC_PROG_CC
 AC_PROG_RANLIB