Robert Scott cb0028b449 pythonPackages.cartopy: fix tests for py2.7 by supplying them with xvfb ... python 2.7's tk is over-eager in trying to open an x display, so run it in xvfb. xvfb is quite a heavy dependency (albeit only a build-time one), so ensure this is only used when needed.		2019-05-06 19:28:23 +01:00
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