adding gtk support for Linux version

[zym1010]

I wonder if opencv can be built with GTK support, as this is needed for some opencv dependent programs, such as https://github.com/yosinski/deep-visualization-toolbox. Thanks.

[patricksnape]

On that I'm not sure - it depends on what the support is like for GTK across different Linux versions.

[zym1010]

@patricksnape are you saying that you want conda-forge's opencv to support those Linux versions that don't come with gtk? I can understand that. If that's the case, then maybe the solution would be compiling a custom opencv myself.

BTW, do you think GTK libraries across different Linux versions are somehow compatible? Say I compile a GTK enable opencv on CentOS 6 and run it in Ubuntu 12.04. Do you think it will work? Thanks.

[patricksnape]

Yes we want conda-forge to run on all Linux versions - we already build in a CentOS 5 6 docker container - which you may have already been using on your Ubuntu machine!

[zym1010]

@patricksnape thanks!

[jakirkham]

we already build in a CentOS 5 docker container

Sorry, correction, we use a CentOS 6 container. Details here.