为什么卡巴尔不构建Eval.hs？

Question

我下载了xmonad-extras-0.10.1.2并运行以下命令:xmonad-extras。extras：http://hpaste.org/78707

$cabal configure
Resolving dependencies...
Configuring xmonad-extras-0.10.1.2...

$cabal build
Building xmonad-extras-0.10.1.2...
Preprocessing library xmonad-extras-0.10.1.2...
In-place registering xmonad-extras-0.10.1.2...

It seems ok but there is no compiled Eval.

$find . -name "*.o"
./dist/build/XMonad/Util/WindowPropertiesRE.o
./dist/build/XMonad/Prompt/MPD.o
./dist/build/XMonad/Actions/Volume.o
./dist/build/HSxmonad-extras-0.10.1.2.o

$find . -name "Eval*"
./XMonad/Prompt/Eval.hs
./XMonad/Actions/Eval.hs

Then i tried use Setup.lhs directly:
$runghc Setup.lhs configure
Configuring xmonad-extras-0.10.1.2...
Setup.lhs: At least the following dependencies are missing:
X11 >=1.4.3, mtl -any, xmonad ==0.10.*, xmonad-contrib ==0.10.*

$ghc-pkg list|grep -i xmonad
xmonad-0.10
xmonad-contrib-0.10

这是奇怪的，任何建议都很感谢！

Answer 1

快速浏览一下，似乎只有在配置包时设置了with_hint标志，才能构建Eval模块。

$ cabal configure -f with_hint