How to install Haskell module encoding-0.6.3 on windows?

My os is Windows 7, and with haskell platform 6.12

HaXml and other dependencies have already installed.

I tried to this after download:

runHaskell Setup.hs configure 

and:

runHaskell Setup.hs configure 
--extra-include-dirs=F:/language/langer/haskell/encoding-0.6.3 
--extra-lib-dirs=F:/language/langer/haskell/encoding-0.6.3

and use cabal:

cabal install encoding

but all above print:

* Missing header file: system_encoding.h
This problem can usually be solved by installing the system package that
provides this library (you may need the "-dev" version). If the library is
already installed but in a non-standard location then you can use the flags
--extra-include-dirs= and --extra-lib-dirs= to specify where it is.

i've tried these on Cygwin and MINGW and MSDOC, all failed.

After googled a lot , i found this (haskll-cafe and google-group have the same content)

they mentioned the "langinfo.h", i found this file under cygwin "/usr/include" . but still doesn't work.

Anyone install encoding-0.6.3 suc开发者_如何学Gocessfully on windows ?

---

In order to build it on Windows it's enough to pass -f-systemEncoding flag to cabal install

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I've had to post this as an answer to keep the formatting though it is really a comment, as I wouldn't follow these steps myself:

Potentially you can get "langinfo.h" installed on MinGW via the libgw32c library - there are some instructions on this page, but they look invasive and they aren't something I'd want to do myself (I like to keep MSYS as clean as possible):

http://placella.com/software/zenity/

Alternatively there is a patch here - but reading the comments this again seems invasive and isn't something I'd want to run (I like to keep my GHC installs as clean as possible):

http://dmwit.com/wyvern/encoding_ffi.dpatch