Error Compilng 'diagrams-pgf-1.4'

[Ηλεκτρολόγος Μηχανικός]

I got an error while compilling `diagrams-pgf-1.4` . 

It has different base, so I tried to unpack it using Stack and changed the version, but still not working. 

I have ghc version 8.2.2 installed. Any idea on how to solve this? Thanks.

/Users/someUser/Projects/Haskell Projects/FlowChart/diagrams-pgf-1.4/src/Diagrams/Backend/PGF/Render.hs:100:10: error:

    • No instance for (Semigroup (Render PGF V2 n))

        arising from the superclasses of an instance declaration

    • In the instance declaration for ‘Monoid (Render PGF V2 n)’

    |

100 | instance Monoid (Render PGF V2 n) where

    |          ^^^^^^^^^^^^^^^^^^^^^^^^

[Brent Yorgey]

Whoops, sorry about that.  I just pushed some patches to the github repository.  If you  git clone http://github.com/diagrams/diagrams-pgf   and build with that, can you confirm whether it works for you?

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[Ηλεκτρολόγος Μηχανικός]

It works great. Thank you very much!

There is a minor warning when building diagrams-pgf.

It comes from .../diagrams-pgf/src/Diagrams/Backend/PGF.hs

warning: [-Wunused-imports]