Thanks for the quick response.  Missing python lib does not seem to be 
problem, because (as I said) PyPlot etc have all been working just fine 
except when a c module using cilk (such as the hello code above) is called 
*before* the "using PyPlot".  Indeed, if I do

using PyPlot
include("hello.jl")
plot(...)

i.e., reverse the order of PyPlot and hello in my earlier example, then it 
works fine on one of my machines but not on the others.  This behavior 
seems a bit odd.

Still, it is quite possibly a problem with my installation.  Can anyone 
reproduce this behavior?

Thanks,
Kevin

On Friday, January 22, 2016 at 5:18:25 AM UTC-7, Lutfullah Tomak wrote:
>
> It is unrelated to Julia because you are missing a python library that is 
> needed by PyPlot. From error, I think you're missing numpy.

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