— Macro: cond-expand <clause1> <clause2> ...

Syntax: Each <clause> should be of the form

(<feature> <expression1> ...)

where <feature> is a boolean expression composed of symbols and `and', `or', and `not' of boolean expressions. The last <clause> may be an “else clause,” which has the form

(else <expression1> <expression2> ...).

The first clause whose feature expression is satisfied is expanded. If no feature expression is satisfied and there is no else clause, an error is signaled.

SLIB cond-expand is an extension of SRFI-0, http://srfi.schemers.org/srfi-0/srfi-0.html.