An error breaks the installation of pandoc-pyplot

[cxzchange]

when i install pandoc-pyplot with cabal install, i catch an error:
`
[1 of 3] Compiling Text.Pandoc.Filter.Scripting ( src/Text/Pandoc/Filter/Scripting.hs, dist/build/Text/Pandoc/Filter/Scripting.o )

src/Text/Pandoc/Filter/Scripting.hs:45:50: error:
* Variable not in scope:
(<>) :: m0 ExitCode -> String -> IO ExitCode
* Perhaps you meant one of these:
</>' (imported from System.FilePath), <$>' (imported from Prelude), *>' (imported from Prelude) Perhaps you want to add <>' to the import list in the import of
`Data.Monoid' (src/Text/Pandoc/Filter/Scripting.hs:27:1-37).

src/Text/Pandoc/Filter/Scripting.hs:57:32: error:
* Variable not in scope: (<>) :: [Char] -> String -> t0
* Perhaps you meant one of these:
</>' (imported from System.FilePath), <$>' (imported from Prelude), *>' (imported from Prelude) Perhaps you want to add <>' to the import list in the import of
`Data.Monoid' (src/Text/Pandoc/Filter/Scripting.hs:27:1-37).

src/Text/Pandoc/Filter/Scripting.hs:57:46: error:
* Variable not in scope: (<>) :: t0 -> [Char] -> PythonScript
* Perhaps you meant one of these:
</>' (imported from System.FilePath), <$>' (imported from Prelude), *>' (imported from Prelude) Perhaps you want to add <>' to the import list in the import of
Data.Monoid' (src/Text/Pandoc/Filter/Scripting.hs:27:1-37). cabal: Leaving directory '.' cabal: Error: some packages failed to install: pandoc-pyplot-1.0.2.0 failed during the building phase. The exception was: ExitFailure 1

on Ubuntu 18.04 gcc-7 ghc-8.0.2 cabal-install version 1.24.0.2

[LaurentRDC]

Hi @cxzchange ,

The only thing I can think of is that your version of the base library is < 4.9. The monoid mappend operator <> was added in the Prelude in version 4.9 (see here). However, I mistakenly allowed older versions of base.

As of right now, I have edited the package metadata on Hackage (see here) so that this particular error will not occur: minimum version of base is now 4.9. If you want to try again, please update your list of cabal packages before installing:

cabal update # Make cabal see the revised version of pandoc-pyplot's metadata
cabal install pandoc-pyplot

Let me know if this fixes your problem.

I will release a new version of pandoc-pyplot that allows for older base versions as soon as I can.

[LaurentRDC]

I've released a new version (1.0.3.0) which should fix this. @cxzchange let me know if I can close this issue.

[cxzchange]

@LaurentRDC I'm sorry for replying you so late! Your work is effective for me. Thank you very much!