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How do I make conditional settings in vim based on whether some command is available in system path?

For example I would like to enable par paragraph formating when the par command is available

Something like this:

if syspathhas("par")
    set formatprg=par\ -w80
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up vote 1 down vote accepted

Use the executable function, as

if executable("par")
    set formatprg=par\ -w80
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