Autoconf, Automake, and Libtool: Automake C++ support

| ### 16.4.2 Automake C++ support Automake provides support for compiling C++ programs. In fact, it makes it practically trivial: files listed in a `SOURCES` primary may include ``.c++'`, ``.cc'`, ``.cpp'`, ``.cxx'` or ``.C'` extensions and Automake will know to use the C++ compiler to build them. For a project containing C++ source code, it is necessary to invoke the `AC_PROG_CXX` macro in ``configure.in'` so that Automake knows how to run the most suitable compiler. Fortunately, when little details like this happen to escape you, `automake` will produce a warning:
    $ automake
    automake: Makefile.am: C++ source seen but CXX not defined in
    automake: Makefile.am: `configure.in'

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