This series of patches, based on next branch
(commit id: 45c5baf2f082dd5f537f043f7637bff87db515e8)
introduces few minor improvements, and one (last) larger,
following
"autoconf: Unset NO_STH and NEED_STH when it is detected not needed"
* [PATCH 1/4] autoconf: Add configure target to main Makefile
* [PATCH 2/4] autoconf: Error out on --without-shell and --without-perl
* [PATCH 3/4] autoconf: Improvements in NO_PYTHON/PYTHON_PATH handling
* [PATCH 4/4] autoconf: Move variables which we always set
to config.mak.in