19.2. A Loadable Module
A feature of the Sic interpreter is that it will use the 'unknown' built in to handle any command line not handled by any of the other registered built-in callback functions. This mechanism is very powerful and enables me to look up unhandled built ins in the user's 'PATH', for instance.
Before adding any modules to the project, I have created a separate subdirectory, 'modules', to put the module source code into. Not forgetting to list this new subdirectory in the AC_OUTPUT macro in 'configure.in', and the SUBDIRS macro in the top-level 'Makefile.am', a new 'Makefile.am' is needed to build the loadable modules:
## Makefile.am — Process this file with automake to produce Makefile.in INCLUDES = -I$(top_builddir) -I$(top_srcdir) ...
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