Haskell cabal-install错误

Question

我遇到了很多问题cabal-install:
1:每次我这样做cabal update,它都会告诉我这样做cabal install cabal-install,所以我这样做,然后当我cabal update再次这样做时,它会说同样的事情.

2:当我尝试ghc-mod从hackage 安装时,它给了我这个错误:

[username@arch ~]$ cabal install ghc-mod
In order, the following will be installed:
haskell-src-exts-1.14.0 (reinstall) changes: pretty-1.1.1.1 -> 1.1.1.0
hlint-1.8.55 (reinstall)
ghc-mod-3.1.4
setup: The program happy version >=1.17 is required but it could not be found.
ghc-mod-3.1.4 depends on haskell-src-exts-1.14.0 which failed to install.
haskell-src-exts-1.14.0 failed during the configure step.
hlint-1.8.55 depends on haskell-src-exts-1.14.0 which failed to install.

所以问题是The program happy version >=1.17 is required but it could not be found.,所以我安装happy 1.19.2使用cabal install happy没有问题.

我cabal install ghc-mod再试一次,同样的错误,所以我试过了cabal install haskell-src-exts --reinstall --force-reinstalls.它给了我以下错误:

[username@arch ~]$ cabal install haskell-src-exts --reinstall --force-reinstalls
Configuring haskell-src-exts-1.14.0...
setup: The program happy version >=1.17 is required but it could not be found.
Failed to install haskell-src-exts-1.14.0
cabal: Error: some packages failed to install:
haskell-src-exts-1.14.0 failed during the configure step. The exception was:
ExitFailure 1

基本上The program happy version >=1.17 is required but it could not be found..那么问题又开心了吗？

我也尝试从hackage下载tar.gz文件并cabal install在.cabal文件上 使用,也修改了.cabal文件以忽略依赖,但仍然失败.

Answer 1

cabal install放置可执行文件~/.cabal/bin.

如果将其添加到路径中,您将能够使用cabal安装的新可执行文件:

$ PATH=$HOME/.cabal/bin:$PATH

Answer 2

我遇到了同样的问题,我解决了安装happy包的问题(令人困惑的包名).因此,在使用cabal安装软件包之前,请使用软件包管理器(apt-get,pacman等)进行安装.这应该是解决问题的方法.