我最近在我的cabal文件中添加了一些新的build-deps但是现在当我运行 stack build 时，我收到以下错误：
-- While attempting to add dependency,
Could not find package api-builder in known packages
-- Failure when adding dependencies:
api-builder: needed (==0.11.0.0), not present in build plan (latest applicable is 0.11.0.0)
http-client: needed (==0.4.20), 0.4.27 found (latest applicable is 0.4.20)
http-types: needed (==0.8.6), 0.9 found (latest applicable is 0.8.6)
needed for package: music-haskell-0.1.0.0
Recommended action: try adding the following to your extra-deps in /Users/.../src/music-haskell/stack.yaml
- api-builder-0.11.0.0
You may also want to try the 'stack solver' command
当我运行 stack solver 时，我收到有关http-types包的错误
cabal: Could not resolve dependencies:
trying: music-haskell-0.1.0.0 (user goal)
next goal: http-types (dependency of music-haskell-0.1.0.0)
rejecting: http-types-0.9 (conflict: music-haskell => http-types==0.8.6)
rejecting: http-types-0.8.6, 0.8.5, 0.8.4, 0.8.3, 0.8.2................
(global constraint requires ==0.9)
Dependency tree exhaustively searched.
根据我的理解，看起来我已经安装了 http-types-0.9 但现在我需要 http-types-0.8.6 . 我最初尝试使用 $stack install http-types 手动安装它，但是我收到以下错误：
Error parsing targets: Specified target version 0.8.6 for package http-types does not match snapshot version 0.9
当我看到我是否可以做 $ stack uninstall 但看起来它已被弃用了 .
如何摆脱 http-type 的快照/全局目标？
1 回答
您可以通过extra-deps覆盖stack.yaml文件中的特定快照包，例如：
一旦开始包含具有与您正在使用的快照相冲突的版本边界的软件包，您最终可能会很快遇到这些问题 . 我推荐的解决方案是：
请求包维护者将他们的包装到Stackage中，这样你就不必手动操作它们
尽可能坚持使用Stackage中的软件包
即使您不是作者，也可以自己向Stackage添加包 . 有关说明，请参阅the maintainer guide .