Making Makefile.PL fail gracefully

[Andy Armstrong]

Can anyone remember how Makefile.PL is supposed to exit if it can't  
find, for example, an executable that it needs. I want the test result  
to be NA rather than FAIL in that case.

I'm sure DAGOLDEN said something sensible about it recently but I'm  
buggered if I can remember :)

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Andy Armstrong, Hexten