non-blocking dependencies

["Larson, Timothy E." <TELarson%west.com@localhost>]

Is there a way to mark a dependency as non-critical, and won't stop the build 
if it doesn't exist?  For example, doxygen is used to create doco, but the 
software will work just fine without doco.  Also, packages may automatically 
disable functionality if prereqs aren't found during configuration, but you 
need to note the dependency if you want to try to build them.


Tim

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