javascript - 如何安装 fay？

Question

我正在运行 ubuntu 13.10，但在安装 fay 时遇到问题。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，但我已经安装了。

$ 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，我尝试自己安装type-eq，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 提示找不到已安装的 cpphs

2. 哪个cpphs说找不到命令

3. 也就是说cpphs不在shell的搜索路径中

4. 在PATH中添加~/.cabal/bin可以解决这个问题