Add the built-in macro $IF() to handle conditionals
Add the built-in macro $IF() to handle conditionals

Add an $IF() macro to conditionally expand macros.  Use it like
this:

    $IF(Expression, IfTrue, IfFalse)

Expression is a Perl expression that can be evaulated at macro
expansion time.  If the expression evaluates to 0, the result will be
IfFalse, otherwise IfTrue.

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