add option for "offscreen" build

[doutriaux1]

On super computers we may not have X11 avail. Adding the possibility to run the metrics built against mesa might make it faster, easier to use.

[durack1]

+1 @doutriaux1 lets set this as a 1.1 milestone so we can get around the issue described at CDAT/cdat#1134

As discussed this will then default to a mesa build on linux and leave the openGL-dependent install on Mac..

[durack1]

@doutriaux1 is there a mesa build option flag available for this? I couldn't find it documented at https://github.com/UV-CDAT/uvcdat/wiki/Install-from-source-command-line-options

[doutriaux1]

@durack1 it is actually a good idea, we should probably add mesa and turn it on by default. The main purpose of this package is to run in batch and produce files, not really meant for interactive purposes.

[durack1]

@doutriaux1 I think this is should be an upstream UVCDAT issue - want me to create an issue for it?

[doutriaux1]

no, it's already in UV-CDAT and it's OFF by default there as it should.

[durack1]

@doutriaux1 ok, well I think https://github.com/UV-CDAT/uvcdat/wiki/Install-from-source-command-line-options needs to be updated to show this functionality exists too..

[doutriaux1]

done. Thanks

[durack1]

@doutriaux1 ok great, so should I wedge that into the install_metrics.sh as an option or the default do you reckon?

[doutriaux1]

yes ti's done waiting for the build on my little suffering mac to be done to confirm and push PR

[durack1]

@doutriaux1 is it in master or a branch? I can kick off a build elsewhere too..

[durack1]

Fixed by #273