Thank you Markus and David, this is sort of what I was afraid of (e.g., 
curdir is shared among threads). Thank you for clarifying this.

As my build scripts require the working directory to be set, I think I 
have to work-around this and do something along the lines of:

    Unix.system "cd my_working_dir && build_cmd"

I wonder if there's some other way of doing this portably and in a 
thread-safe fashion?

Best regards,
Janne Hellsten

>  
>

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