Doesn't detect Graphviz on linux

[Stephanevg]

Hi,

I wasn't sure if PSgraph is 'supported' on Linux.
I am on ubuntu 1804, and I have the following error message when I try to create a graph:

As you could seem these are automated tests.

I have installed Graphviz using: sudo apt install graphviz (I had to follow this first https://packages.ubuntu.com/trusty/amd64/graphviz/download )

If it is supported on linux, the errors messages are wrong, as there is no program files on Linux

[Stephanevg]

I added a pull request to change the error message: #86
I think there is also a problem on the versions between the one available on the gallery, and the one you have on your master branch, but I'll create a seperate issue for that. (See here --> #87)

[KevinMarquette]

Thank you for the changes.

I have been depending on the community for Linux and MacOS support so we have been slowly working out the cross platform related nuances. The core commands are platform agnostic for generating the graphviz dot DSL.

[Stephanevg]

Hi @KevinMarquette Is this something you have been working to Improve since?