--- configure.ac.old	2019-11-06 09:11:19.746506805 +0100
+++ configure.ac	2019-11-06 09:12:22.031606854 +0100
@@ -9,6 +9,9 @@
 AC_PROG_AWK
 AC_PROG_CC
 AC_PROG_INSTALL
+m4_pattern_allow([AM_PROG_AR])
+AM_PROG_AR
+AM_PROG_CC_C_O
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 m4_ifdef([AC_PROG_LIB],[AC_PROG_LIB],[m4_warn(portability,[Missing AC_PROJ_LIB])])
 AC_PROG_OBJC