diff -Naur libiconv-1.16-orig/configure.ac libiconv-1.15/configure.ac
--- libiconv-1.16-orig/configure.ac	2016-12-04 07:33:04.000000000 -0500
+++ libiconv-1.16/configure.ac	2018-05-01 17:27:00.747183900 -0400
@@ -19,6 +19,7 @@ AC_PREREQ([2.63])
 AC_INIT([libiconv], [1.16])
 AC_CONFIG_SRCDIR([lib/iconv.c])
 AC_CONFIG_AUX_DIR([build-aux])
+AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE
 AC_CONFIG_HEADERS([config.h lib/config.h])
 AC_PROG_MAKE_SET
diff -Naur libiconv-1.16-orig/libcharset/configure.ac libiconv-1.16/libcharset/configure.ac
--- libiconv-1.16-orig/libcharset/configure.ac	2019-01-06 11:51:40.000000000 +0300
+++ libiconv-1.16/libcharset/configure.ac	2019-06-05 08:27:01.232776400 +0300
@@ -19,6 +19,7 @@
 AC_INIT([libcharset], [1.4])
 AC_CONFIG_SRCDIR([lib/localcharset.c])
 AC_CONFIG_AUX_DIR([build-aux])
+AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([config.h])
 AC_PROG_MAKE_SET