ImportError("No module named 'matplotlib'",)

I complied Julia under Archlinux. Successfully added PyPlot package, but failed in loading it:

```
julia> using(PyPlot)
ERROR: PyError (PyImport_ImportModule)
ImportError("No module named 'matplotlib'",)

in pyerr_check at /home/hellolj/.julia/PyCall/src/exception.jl:58
in pyimport at /home/hellolj/.julia/PyCall/src/PyCall.jl:85
in reload_path at loading.jl:146
in _require at loading.jl:59
in require at loading.jl:43
while loading /home/hellolj/.julia/PyPlot/src/PyPlot.jl, in expression starting on line 32
```

I suspect that this error happened because under Arch Linux, ipython 2.7 is named ipython2 insteady of ipython by default on Julia side.

Can anyone help with this issue?

Thanks,