This patch makes the following changes to configure.ac: 1. Aliases all --enable- options to --with (see the macro XE_ARG_ENABLE_OR_WITH below). 2. Requires that only autoconf 2.59 be used to generate the configure script 3. Replaces numerous blank lines with the proper m4 'blank line' macro. This prevents stray blan lines appearing at the wrong places in the configure script. The aliasing means that any option that was previously available only as --enable now can be set with --with as well (and --without instead of --disable). In addition the option appears in the help output in both forms. Existing --with options are not aliased to --enable.