阴谋集团解决依赖问题答案

【问题标题】：Cabal trouble resolving dependencies阴谋集团解决依赖问题
【发布时间】：2019-11-07 13:38:25
【问题描述】：

我正在尝试使用cabal v2-install cabal-debian 全局安装包cabal-debian 并收到以下错误消息：

Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: base-4.12.0.0/installed-4.1... (user goal)
[__1] trying: binary-0.8.7.0 (user goal)
[__2] next goal: ghc (user goal)
[__2] rejecting: ghc-8.6.5/installed-8.6... (conflict: binary==0.8.7.0, ghc =>
binary==0.8.6.0/installed-0.8...)
[__2] trying: ghc-8.6.5
[__3] rejecting: ghc:-buildable (conflict: base==4.12.0.0/installed-4.1...,
ghc -buildable => base<0)
[__3] rejecting: ghc:+buildable (manual flag can only be changed explicitly)
[__3] fail (backjumping, conflict set: base, ghc, ghc:buildable)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: binary, base, ghc, ghc:buildable
Try running with --minimize-conflict-set to improve the error message.

我正在使用cabal 3.0.0.0 并安装了ghc 8.6.5。

【问题讨论】：

标签： haskell cabal cabal-install

【解决方案1】：

在我看来，您安装的binary 版本似乎与编译器附带的引导库不兼容。我建议您编辑文件

~/.ghc/<something>-8.6.5/environments/default

并删除提及binary 的行，然后重试。（<something> 几乎可以肯定是x86_64-linux。）

【讨论】：

你猜怎么会这样？
@Ackdari 大概您要求安装一些依赖于binary（可能是binary 本身）的库，而不是与所选binary 版本冲突的引导库。