I meant that, for example, you could use a rule like
Build only if
["%MACRO1%" = "t" And "%MACRO2%" = "b"]
is true
to compare the values of two different macros with strings.
If this doesn't help:
http://www.kinook.com/Forum/showthread.php?t=927
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http://www.kinook.com/Forum/showthread.php?t=3044