diff --git a/Makefile.am b/Makefile.am
index b2b6cef00..845543721 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,8 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
-# not a GNU package. You can remove this line, if
-# have all needed files, that a GNU package needs
-AUTOMAKE_OPTIONS = gnu 1.6
+AUTOMAKE_OPTIONS = gnu 1.14
 
 .DELETE_ON_ERROR:
 
diff --git a/configure.ac b/configure.ac
index 0bac37e5d..b13af86d8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,7 +24,6 @@ AC_LANG([C])
 AC_PROG_CC
 # autoconf 2.70 obsoletes AC_PROG_CC_C99 and includes it in AC_PROG_CC
 m4_version_prereq([2.70],[],[AC_PROG_CC_C99])
-AM_PROG_CC_C_O
 AC_PROG_RANLIB
 
 # If macro PKG_PROG_PKG_CONFIG is not available, Autoconf generates a misleading error message,