Re: [Haskell-beginners] Install bullet-0.2.2 failure in OS X 10.8.2

6 Dec 2012

      Hi there,

After installing c2hs, and run cabal install bullet. I got this error. Did
I miss any step?

Resolving dependencies...
Configuring bullet-0.2.2...
Building bullet-0.2.2...
Preprocessing library bullet-0.2.2...
[ 1 of 17] Compiling Physics.Bullet.Raw.Types (
Physics/Bullet/Raw/Types.hs, dist/build/Physics/Bullet/Raw/Types.o )
[ 2 of 17] Compiling Physics.Bullet.Raw.C2HS ( Physics/Bullet/Raw/C2HS.hs,
dist/build/Physics/Bullet/Raw/C2HS.o )

Physics/Bullet/Raw/C2HS.hs:211:12:
    Could not deduce (Eq a) arising from a use of `toBool'
    from the context (Num a)
      bound by the type signature for cToBool :: Num a => a -> Bool
      at Physics/Bullet/Raw/C2HS.hs:211:1-17
    Possible fix:
      add (Eq a) to the context of
        the type signature for cToBool :: Num a => a -> Bool
    In the expression: toBool
    In an equation for `cToBool': cToBool = toBool
Failed to install bullet-0.2.2
cabal: Error: some packages failed to install:
bullet-0.2.2 failed during the building phase. The exception was:
ExitFailure 1

Best regards,
Trung

2012/12/6 Krzysztof Skrzętnicki 
...
The line:
...
cabal: The program c2hs is required but it could not be found.
is pretty clear about the source of error. You have to install c2hs first
and make sure its in PATH. Use either some packaged version of c2hs or
"cabal install c2hs".
Best regards,
Krzysztof Skrzętnicki
On Thu, Dec 6, 2012 at 11:48 AM, Trung Quang Nguyen wrote:
...
The program c2hs is required but it could not be found.
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