haskell cabal sandbox如何安装软件包？ [英] haskell cabal sandbox how to install packages?

问题描述

我希望有人告诉我在沙箱中安装 gloss-examples 所需的步骤及其所有依赖项。
这是我尝试做的事情：

I wish if someone tells me the steps required to install gloss-examples in a sandbox along with all its dependencies. Here is what I tried to do:

我从下载了 gloss-examples 包href = https://hackage.haskell.org/package/gloss-examples-1.9.4.1/gloss-examples-1.9.4.1.tar.gz rel = nofollow>黑客。

I downloaded the gloss-examples package from hackage.

当我运行命令时，更改为〜/ gloss / gloss-examples-1.9.4.1

When I ran the command, after changing into the ~/gloss/gloss-examples-1.9.4.1

~/gloss/gloss-examples-1.9.4.1$cabal sandbox init

成功，所以我发出了命令

it succeeded, so I issued the command

~/gloss/gloss-examples-1.9.4.1$cabal install --only-dependencies

但是后来我得到了以下内容错误：

but then I got the following errors:

Resolving dependencies...
cabal: Could not resolve dependencies:
trying: gloss-examples-1.9.4.1 (user goal)
next goal: base (dependency of gloss-examples-1.9.4.1)
rejecting: base-4.5.0.0/installed-c8e... (conflict: gloss-examples =>
base==4.8.*)
rejecting: base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1,
base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0,
base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2,
base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2,
base-3.0.3.1 (constraint from non-upgradeable package requires installed
instance)
Dependency tree exhaustively searched.

Note: when using a sandbox, all packages are required to have consistent
dependencies. Try reinstalling/unregistering the offending packages or
recreating the sandbox.

如何安装此软件包光泽示例及其所有依赖项仅在沙箱目录中？我想我知道，cabal sandbox允许您安装所有依赖项（某些或全部与全局安装的软件包冲突）的任意软件包安装在单独的目录中。
这可能吗？
我想我缺少了一些东西。这是阴谋沙箱的正确用例吗？
看到以下内容

How do I install this package gloss-examples and all its dependencies in the sandbox directory only? I think I understand that cabal sandbox allows you to install any arbitrary package with all dependencies (some or all them conflicting with globally installed packages) installed in a separate directory. Is this even possible? I think I am missing something. Is this a right use-case for cabal sandbox? Seeing the following

注意：使用沙箱时，所有软件包都必须具有一致的依赖性。

冲突的依赖项和不一致的依赖项？

我尝试了许多教程，包括此，但无法理解如何使用阴谋沙箱。

I tried many tutorials including this but could not understand how to use cabal sandbox.

推荐答案

它在我看来，您下载的光泽示例版本与您的 base 库版本不兼容。有两种方法可以解决此问题：

It appears to me that you have downloaded a version of gloss-examples that is not compatible with your version of the base library. There are two ways to fix this:




1. 下载与您的<$ c兼容的版本（可能是较旧的版本） $ c> base 库。 关于Hackage的软件包的内容页面在顶部附近列出了很多可用版本。可能也可以使用取刺来做到这一点—我不确定。

1. Download a version (presumably an older one) that is compatible with your base library. The contents page for the package on Hackage has a long list of available versions near the top. It may also be possible to use cabal fetch to do this—I'm not sure.

升级GHC以获得更新的基础。您通常不能在不升级GHC的情况下升级 base 。

Upgrade GHC to get a newer base. You generally cannot upgrade base without upgrading GHC.

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