CODEWITHSUNDEEP
haskellgtk2hs
a1kmm
a1kmm

Reputation: 1402

How can I fix the "Unacceptable result type in foreign declaration: CULong" error building gtk2hs packages?

When trying to compile the gtk Haskell package with ghc-7.6.1, I get the following error (when trying to build pango, one of the dependencies, but it also occurs in other dependency packages if I try to install them manually):

[ 1 of 14] Compiling Graphics.Rendering.Pango.Types ( dist/build/Graphics/Rendering/Pango/Types.hs, dist/build/Graphics/Rendering/Pango/Types.o )

Graphics/Rendering/Pango/Types.chs:249:1:
    Unacceptable result type in foreign declaration: CULong
    When checking declaration:
      foreign import ccall unsafe "static pango_context_get_type" pango_context_get_type
        :: CULong

I previously installed an older version of gtk2hs, and so this occurs during an upgrade.

How can I fix the error?

Upvotes: 4

Views: 376

Answers (1)

a1kmm
a1kmm

Reputation: 1402

This problem occurs if you have old versions of the gtk2hs-buildtools installed, which don't work with newer versions of ghc. The solution is to update your gtk2hs-buildtools package before continuing with the update:

sudo cabal install --reinstall gtk2hs-buildtools

Upvotes: 5

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