wscript and friends have various things like:
if ctx.env.DEST_OS in ["freebsd", "openbsd"]:
ctx.env.PLATFORM_INCLUDES = ["/usr/local/include"]
I think the PLATFORM_ part is leftover from an old old version of waf.
ctx.env.PLATFORM_INCLUDES works because our code has things like:
Hal Murray :
> -* We intend to fully support Network Time Security and to be first or
> - second interop on that standard once it is finalized. At that
> - point, older insecure authentication methods (MAC and MS-SNTP) may
> - be removed.
> +* Now that we have full Network Time Security, a
