Installed libraries and header files:
It installs a library libffcall.{a,so}; to link with it, use the compiler option '-lffcall'.
It consists of two parts:
* avcall - calling C functions with variable arguments. Its include file is <avcall.h>.
* callback - closures with variable arguments as first-class C functions. Its include file is <callback.h>.
Additionally, you can determine the libffcall version by including <ffcall-version.h>.
For backward compatibility with versions 1.x, libraries libavcall.{a,so} and libcallback.{a,so} are installed as well. But they are deprecated; use libffcall.{a,so} instead.