examples/calc++ if no C++ compiler is available.
* examples/calc++/Makefile: Remove, replaced by... * examples/calc++/Makefile.am: ... this new file. * examples/calc++/test: Remove input. * examples/calc++/compile: Remove. * examples/Makefile.am: New. * configure.ac, Makefile.am: Adjust. * doc/Makefile.am (clean-local): New, for more recent texi2dvis.