Silences notice on newer autoconf: libtoolize: Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and libtoolize: rerunning libtoolize, to keep the correct libtool macros in-tree. This helps keep the top-level build directory clean, too
Silences warning on newer autoconf: aclocal: warning: autoconf input should be named 'configure.ac', not 'configure.in'