我该如何安装fay？

Question

我正在运行ubuntu 13.10而且我在安装fay时遇到了麻烦。我使用 sudo apt-get install haskell-platform 安装了haskell。我尝试cabal install fay并收到以下消息：

$ cabal install fay
Resolving dependencies...
Configuring type-eq-0.4.2...
cabal: The program cpphs is required but it could not be found.
Failed to install type-eq-0.4.2
cabal: Error: some packages failed to install:
fay-0.20.0.0 depends on type-eq-0.4.2 which failed to install.
haskell-names-0.3.3.2 depends on type-eq-0.4.2 which failed to install.
type-eq-0.4.2 failed during the configure step. The exception was:
ExitFailure 1

我尝试安装cpphs，但我已经拥有它了。

$ cabal install cpphs
Resolving dependencies...
All the requested packages are already installed:
cpphs-1.18.4
Use --reinstall if you want to reinstall anyway.

最后，我尝试自行安装type-eq，并且预计它依赖于cpphs。

$ cabal install type-eq
Resolving dependencies...
Configuring type-eq-0.4.2...
cabal: The program cpphs is required but it could not be found.
Failed to install type-eq-0.4.2
cabal: Error: some packages failed to install:
type-eq-0.4.2 failed during the configure step. The exception was:
ExitFailure 1

我该怎么办？在此先感谢您的帮助。

Answer 1

根据原帖的评论：

1. cabal抱怨无法找到已安装cpphs

2. which cpphs说命令无法找到

3. 表示cpphs不在shell

的搜索路径中

4. 将~/.cabal/bin添加到PATH可用于解决此问题