Does BMax supports Compiler directives?

Haven't found something in the manual:

Does BlitzMax support Compiler Directives, like in C, so I can build different builds of my application. For example something like this:

#define SOMETHING

[...]

#ifdef SOMETHING
   [... some code here...]
#endif

there are some but they are restricted to OS compile restriction.

?Win32
?Linux
?Mac (i think it was that)
?OS

I recently added this to the wiki:
http://www.blitzwiki.org/index.php/Category:Compiler_Directives

bb2d/3d/plus support directives... you should use CONST

CONST demo=1
IF DEMO=0 THEN
...
ENDIF

but i don't tested this with bbmax