Here are few demos showing how to use both Libusual and Antimake in various scenarios. If you wonder why there is so many of them, the reason is that these demos are also used as regressions tests for various functionality. (Thus, temos)
They are ordered in ascending complexity, so pick first one if you want simplest overview.
libusual1 - Local libusual: Linking against libusual.a with plain Make
libusual2 - Local libusual: Embedding libusual modules with/witout Antimake
libusual3 - Local libusual: Using top-level autoconf with Antimake
libusual4 - Installed libusual: Plain make
libusual5 - Installed libusual: Antimake
libusual6 - Installed libusual: Autoconf