我尝试使用reflex安装reflex-dom和cabal install时出现以下错误消息：
$ cabal install reflex-dom
...
cabal: The following packages are likely to be broken by the reinstalls:
lens-4.15.1
ghcjs-0.2.0
free-4.12.4
kan-extensions-5.0.1
adjunctions-4.3
Use --force-reinstalls if you want to install anyway.
GitHub上的
ghcjs位于“ master”分支的0.2.0上，而位于名为“ dedupe”的分支的0.2.1上。而且我也怕打破lens。有什么方法可以一致地安装reflex和reflex-dom吗？也许我需要更改.cabal文件这是终端机的完整回复
$ cabal install reflex-dom
Resolving dependencies...
In order, the following would be installed:
bifunctors-5.3 (latest: 5.4.1) (via: reflex-dom-0.3 these-0.6.2.1 lens-4.13.2.1 free-4.12.4 semigroupoids-5.0.1 profunctors-5.2) (new version)
data-default-instances-base-0.1.0.1 (via: data-default-0.5.3) (new package)
data-default-0.5.3 (latest: 0.7.1.1) (via: reflex-dom-0.3) (new version)
dependent-sum-0.3.2.2 (latest: 0.4) (via: reflex-dom-0.3 reflex-0.4.0 dependent-sum-template-0.0.0.5 dependent-map-0.2.4.0) (new package)
dependent-map-0.2.4.0 (via: reflex-dom-0.3 reflex-0.4.0) (new package)
exception-transformers-0.4.0.5 (via: reflex-dom-0.3 reflex-0.4.0) (new package)
haskell-src-exts-1.17.1 (latest: 1.19.1) (via: reflex-0.4.0 haskell-src-meta-0.6.0.14) (new version)
haskell-src-meta-0.6.0.14 (latest: 0.7.0.1) (via: reflex-0.4.0) (new version)
profunctors-5.2 (via: these-0.6.2.1 lens-4.13.2.1 adjunctions-4.3 free-4.12.4) (reinstall) (changes: bifunctors-5.4.1 -> 5.3)
raw-strings-qq-1.1 (via: reflex-dom-0.3) (new package)
ref-tf-0.4.0.1 (via: reflex-dom-0.3 reflex-0.4.0) (new package)
semigroupoids-5.0.1 (latest: 5.1) (via: these-0.6.2.1 lens-4.13.2.1 kan-extensions-5.0.1 adjunctions-4.3 free-4.12.4) (new version)
free-4.12.4 (via: lens-4.13.2.1 kan-extensions-5.0.1 adjunctions-4.3) (reinstall) (changes: bifunctors-5.4.1 -> 5.3, semigroupoids-5.1 -> 5.0.1)
adjunctions-4.3 (via: kan-extensions-5.0.1) (reinstall) (changes: semigroupoids-5.1 -> 5.0.1)
kan-extensions-5.0.1 (via: lens-4.13.2.1) (reinstall) (changes: semigroupoids-5.1 -> 5.0.1)
lens-4.13.2.1 (latest: 4.15.1) (via: reflex-dom-0.3) (new version)
th-extras-0.0.0.4 (via: dependent-sum-template-0.0.0.5) (new package)
dependent-sum-template-0.0.0.5 (via: reflex-dom-0.3) (new package)
these-0.6.2.1 (latest: 0.7.3) (via: reflex-dom-0.3 reflex-0.4.0) (new package)
reflex-0.4.0 (via: reflex-dom-0.3) (new package)
utf8-string-1.0.1.1 (via: glib-0.13.4.1 cairo-0.13.3.1) (new package)
cairo-0.13.3.1 (via: webkitgtk3-0.14.2.1 gtk3-0.14.6 pango-0.13.3.1) (new package)
glib-0.13.4.1 (via: reflex-dom-0.3 webkitgtk3-javascriptcore-0.13.2.0 ghcjs-dom-0.2.4.0 webkitgtk3-0.14.2.1 gtk3-0.14.6 pango-0.13.3.1 gio-0.13.3.1) (new package)
gio-0.13.3.1 (via: gtk3-0.14.6) (new package)
pango-0.13.3.1 (via: webkitgtk3-0.14.2.1 gtk3-0.14.6) (new package)
gtk3-0.14.6 (via: reflex-dom-0.3 webkitgtk3-javascriptcore-0.13.2.0 ghcjs-dom-0.2.4.0 webkitgtk3-0.14.2.1) (new package)
webkitgtk3-0.14.2.1 (via: reflex-dom-0.3 webkitgtk3-javascriptcore-0.13.2.0 ghcjs-dom-0.2.4.0) (new package)
ghcjs-dom-0.2.4.0 (latest: 0.7.0.4) (via: reflex-dom-0.3) (new package)
webkitgtk3-javascriptcore-0.13.2.0 (latest: 0.14.2.1) (via: reflex-dom-0.3) (new package)
reflex-dom-0.3 (new package)
cabal: The following packages are likely to be broken by the reinstalls:
lens-4.15.1
ghcjs-0.2.0
Use --force-reinstalls if you want to install anyway.
和类似的安装反射
$ cabal install reflex
Resolving dependencies...
In order, the following would be installed:
bifunctors-5.3 (latest: 5.4.1) (via: these-0.6.2.1 semigroupoids-5.0.1 profunctors-5.2) (new version)
dependent-sum-0.3.2.2 (latest: 0.4) (via: reflex-0.4.0 dependent-map-0.2.4.0) (new package)
dependent-map-0.2.4.0 (via: reflex-0.4.0) (new package)
exception-transformers-0.4.0.5 (via: reflex-0.4.0) (new package)
haskell-src-exts-1.17.1 (latest: 1.19.1) (via: reflex-0.4.0 haskell-src-meta-0.6.0.14) (new version)
haskell-src-meta-0.6.0.14 (latest: 0.7.0.1) (via: reflex-0.4.0) (new version)
profunctors-5.2 (via: these-0.6.2.1) (reinstall) (changes: bifunctors-5.4.1 -> 5.3)
ref-tf-0.4.0.1 (via: reflex-0.4.0) (new package)
semigroupoids-5.0.1 (latest: 5.1) (via: these-0.6.2.1) (new version)
these-0.6.2.1 (latest: 0.7.3) (via: reflex-0.4.0) (new package)
reflex-0.4.0 (new package)
cabal: The following packages are likely to be broken by the reinstalls:
lens-4.15.1
ghcjs-0.2.0
free-4.12.4
kan-extensions-5.0.1
adjunctions-4.3
Use --force-reinstalls if you want to install anyway.
最佳答案
我知道在Linux环境上以一致的方式安装reflex和reflex-dom（以及ghcjs）的最佳方法是遵循setup instructions on the reflex-platform readme。
该过程相当于克隆反射平台存储库并从该存储库内部运行脚本“ try-reflex”。 try-reflex脚本启动一个外壳程序，您可以从中运行ghcjs来完全访问reflex / reflex-dom。此外壳环境独立于您先前在计算机上安装的外壳环境，因此您不必担心弄乱镜头或已经安装的任何其他电缆包。
关于haskell - 安装reflex-dom可能会破坏ghcjs，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/42320908/