- here we have my first attempt at building a tool to build Makefiles for simple C projects,
  dating to the late 1990s, called mfbuild.

- it works by determining which local .h files are included in a single main program, and
  assuming that if fred.h is included, and fred.c also exists, then they form a single
  2-part module called fred, and hence fred.c should be analysed for which local .h files
  it includes, and fred.o will need to be linked with the main program, and so on.

- build it by 'make' and install it into TOOLDIR/bin/ARCH by 'make install', complete
  with man page and standard all-project definitions

- note that there's also a Perl version in 03.perl-mfbuild, and there's little point in
  having both the c-version and this perl-version installed.  Pick one:-)
