构建GHC：尽管成功安装了cabal，但配置失败仍然很快乐
[英]Building GHC: configure fails on happy despite successful cabal install
问题描述
I am attempting to build GHC from source following this page . 
我试图在此页面之后从源代码构建GHC。 When installing dependencies, I had to install happy and alex : 安装依赖项时，我必须安装happy和alex ：
$ cabal install alex happy
Resolving dependencies...
Configuring alex-3.2.1...
Configuring happy-1.19.5...
Building happy-1.19.5...
Building alex-3.2.1...
Installed alex-3.2.1
Installed happy-1.19.5
yet when running configure I get an error message: 但是在运行configure我收到一条错误消息：
$ ./configure
...
checking for happy... no
checking for version of happy...
configure: error: Happy version 1.19.4 or later is required to compile GHC.
I am running on Debian stretch : 我在Debian运行stretch ：
$ uname -a
Linux <host> 4.8.0-1-amd64 #1 SMP Debian 4.8.5-1 (2016-10-28) x86_64 GNU/Linux
Can anyone suggest an obvious step I could try to resolve this? 任何人都可以建议一个明显的步骤我可以尝试解决这个问题
2 个解决方案
解决方案1
5 2017-07-05 19:43:14
You should install alex and happy as Debian packages as well. 您应该安装alex和happy作为Debian软件包。 On a Debian machine, you can use apt-get for that: 在Debian机器上，您可以使用apt-get ：
sudo apt-get install alex happy
解决方案2
5 已采纳 2017-07-05 20:36:04
I suspect you simply don't have them on your PATH. 我怀疑你的PATH上根本就没有它们。 Make sure to include something like 确保包含类似的内容
PATH="$HOME/.cabal/bin:$PATH"
in your .bashrc (or startup files for whatever shell you use). 在你的.bashrc（或你使用的任何shell的启动文件）。 Installing them through the package manager simply installed them in a location that was already on your PATH. 通过包管理器安装它们只需将它们安装在PATH上已有的位置即可。
Even if you have things working now, you should consider modifying your .bashrc while it's fresh in your head, as other cabal-install'd executables will get put there in the future. 即使你现在有工作，你也应该考虑修改你的.bashrc，因为其他的cabal-install'd可执行文件将在未来放置。
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