- allow different prefix and installation directory (PREFIX vs. DESTDIR)
- allow local customisation (per build-dir) of package
	- by the same mechanism also allow customisation of
		packages by other packages
- update README.txt for the new enable/disable and builddir stuff (partially done, builddir stuff missing)
- try to find a way to build CGAL out of tree
- find out how to force Open* to build statically
- check that all product-specific targets are implemented in non-autoconf-products
- switch gts to their new Darcs repository (http://darcs.net, http://gts.sourceforge.net/darcs)
- provide setup scripts for csh
