See documentation in doc/index.html or at http://plausible.org/nasal

Important source to read is nasal.h, nasal-bin.c, and lib.c.  These
define and implement the user-side extension API.

Don't use the -ansi switch to gcc.  It turns off preprocessor
recognition of the "// ..." commenting style, which Nasal uses
pervasively and is supported by all modern C compilers.  Note that
-ansi doesn't generate better code, nor find any extra warning
conditions.  Pedants can take refuge in the fact that Nasal is
compliant with the emerging ANSI C99 standard.

Feel free to send questions and comments to me at andy@plausible.org
 - Andy Ross