Attached is a patch to configure.in (1.47) and conf/aclocal.m4 (1.8)
that tidies up the use of AC_DEFINE macro according to autoconf
2.59 and autoheader 2.59.
The patch to conf/config.h.in has not provided as the file can be
entirely regenerated by running
The configure script will be generated by the following command:
autoconf --include conf