Maybe we should use $PATH here as default?

[OskarStark]

https://github.com/graste/environaut/blob/master/src/Environaut/Checks/ExecutableCheck.php#L83

A benefit would be to have the correct order of the directories, the system would use....

[DracoBlue]

+1

Maybe a simple "which executable" instead?

[graste]

You mean like it is already done in line 153? Other than that I think the idea of using the $PATH to set the default choices in order to get some good lookup folders is not bad. The used defaults are ones that are often used though.