我有一个依赖于 iconv 的项目，因为我需要使用 cp1251 代码页。这是问题项目的最小实现。我已经从这里安装了 iconv并像这样成功安装了 haskell 包“iconv”
cabal install iconv --extra-include-dirs="C:\GnuWin32\include" --extra-lib-dirs="C:\GnuWin32\lib"
软件包 iconv 已正确安装，但依赖它的项目链接失败，这就是发生的事情。
c:\iconvsmpl>cabal configure --extra-include-dirs="C:\GnuWin32\include" --extra-
lib-dirs="C:\GnuWin32\lib"
Warning: The package list for 'hackage.haskell.org' is 16 days old.
Run 'cabal update' to get the latest list of available packages.
Resolving dependencies...
Configuring iconvsmpl-0.1.0.0...
Warning: The 'license-file' field refers to the file 'LICENSE' which does not
exist.
c:\iconvsmpl>cabal build
Building iconvsmpl-0.1.0.0...
Preprocessing executable 'iconvsmpl' for iconvsmpl-0.1.0.0...
[1 of 1] Compiling Main ( iconvsmpl.hs, dist\build\iconvsmpl\iconvsm
pl-tmp\Main.o )
Linking dist\build\iconvsmpl\iconvsmpl.exe ...
C:\Users\admin\AppData\Roaming\cabal\iconv-0.4.1.1\ghc-7.6.3/libHSiconv-0.4.1.1.
a(hsiconv.o):hsiconv.c:(.text+0x7): undefined reference to `_imp__libiconv_open'
C:\Users\admin\AppData\Roaming\cabal\iconv-0.4.1.1\ghc-7.6.3/libHSiconv-0.4.1.1.
a(hsiconv.o):hsiconv.c:(.text+0x17): undefined reference to `_imp__libiconv'
C:\Users\admin\AppData\Roaming\cabal\iconv-0.4.1.1\ghc-7.6.3/libHSiconv-0.4.1.1.
a(hsiconv.o):hsiconv.c:(.text+0x27): undefined reference to `_imp__libiconv_clos
e'
collect2: ld returned 1 exit status
c:\iconvsmpl>
为什么 iconv 安装并链接，但 iconvsmpl 无法链接。如何在 Windows 下构建它？是否有另一种方法可以在 Windows 下为 Haskell 使用外部编码？
具有适用于 Windows 的可执行文件是非常可取的。在 Linux 下构建和运行包。
Haskell-Platform 的版本是 2013.2.0.0