麻煩 cabal 安裝 http-conduit

Question

當我運行cabal install http-conduit時，我得到以下信息：

Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: base-4.12.0.0/installed-4.1... (user goal)
[__1] trying: ghc-8.6.5/installed-8.6... (user goal)
[__2] next goal: process (user goal)
[__2] rejecting: process-1.6.7.0 (constraint from user target requires
==1.6.6.0)
[__2] rejecting: process-1.6.6.0 (conflict: ghc =>
process==1.6.5.0/installed-1.6...)
[__2] rejecting: process-1.6.5.1, process-1.6.5.0/installed-1.6...,
process-1.6.5.0, process-1.6.4.0, process-1.6.3.0, process-1.6.2.0,
process-1.6.1.0, process-1.6.0.0, process-1.5.0.0, process-1.4.3.0,
process-1.4.2.0, process-1.4.1.0, process-1.4.0.0, process-1.3.0.0,
process-1.2.3.0, process-1.2.2.0, process-1.2.1.0, process-1.2.0.0,
process-1.1.0.2, process-1.1.0.1, process-1.1.0.0, process-1.0.1.5,
process-1.0.1.4, process-1.0.1.3, process-1.0.1.2, process-1.0.1.1,
process-1.0.0.0 (constraint from user target requires ==1.6.6.0)
[__2] fail (backjumping, conflict set: ghc, process)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: process, base, ghc

我正在運行 cabal v3.0.0.0 和 ghc v8.6.5

我對 Haskell 生態系統還很陌生，因此我將不勝感激。 謝謝！

Answer 1

看起來您有依賴沖突，一個 package 需要與您嘗試安裝的 package 不同的版本。 對於新用戶來說，這可能很難解決。

If you are new to Haskell and want to start using dependencies from Hackage , the centralized package archive for Haskell, I recommend using stack ( install instructions and basic workflow . stack is a tool built on top of cabal that includes a curated list of package versions是兼容的。它應該讓你更容易上手。