无法通过cabal安装sdl2 [英] Can't install sdl2 via cabal

问题描述

我试图安装 helm 。当我尝试安装它时，但是我得到这个错误：

  $ cabal install helm 
正在解析依赖关系... 
配置sdl2-1.1.0 ... 
 cabal：pkg-config软件包的'sdl2'版本> = 2.0.3是必需的，但它可能不能找到
。 
无法安装sdl2-1.1.0 
 cabal：错误：某些软件包未能安装：
 helm-0.6.1取决于sdl2-1.1.0，无法安装。 
 sdl2-1.1.0在配置步骤中失败。例外情况是：
 ExitFailure 1 
  

当我自己安装sdl2时，类似的消息。

  $ cabal install sdl2 
正在解析依赖项... 
配置sdl2-1.1。 0 ... 
 cabal：pkg-config软件包的'sdl2'版本> = 2.0.3是必需的，但它可能没有找到
。 
未能安装sdl2-1.1.0 
 cabal：错误：某些软件包未能安装：
 sdl2-1.1.0在配置步骤中失败。例外情况是：
 ExitFailure 1 
  

我不明白。根据Hackage的说法，sdl2版本为1.1，但是安装它需要2.0.3版本？我已经试过了这个进出沙箱。 ghc-pkg list 的结果在这里，如果您认为它们是相关的： http://pastebin.com/tFrsfPFe

我在Ubuntu上使用btw。

帮助？

解决方案

其他安装可能发生的事情（发生在我身上）是PKG_CONFIG_PATH变量可能不指向包配置文件（sdl2.pc，在/ usr / local / lib / pkgconfig目录中）。 pkg-config使用一些默认目录（'/ usr / lib / pkgconfig'和'/ usr / share / pkgconfig'），但是如果sdl.pc文件不在其中之一，你必须指定目录在环境变量中。你可以用 echo $ PKG_CONFIG_PATH

来检查它。

如果事实证明你需要设置变量， code> export PKG_CONFIG_PATH = / usr / local / lib / pkgconfig （或者你的sdl2.pc文件所在的目录）

I am trying to install helm. When I try to install it, however I get this error:

$ cabal install helm
Resolving dependencies...
Configuring sdl2-1.1.0...
cabal: The pkg-config package 'sdl2' version >=2.0.3 is required but it could
not be found.
Failed to install sdl2-1.1.0
cabal: Error: some packages failed to install:
helm-0.6.1 depends on sdl2-1.1.0 which failed to install.
sdl2-1.1.0 failed during the configure step. The exception was:
ExitFailure 1

When I go to install sdl2 by itself, I get a similar message.

$ cabal install sdl2
Resolving dependencies...
Configuring sdl2-1.1.0...
cabal: The pkg-config package 'sdl2' version >=2.0.3 is required but it could
not be found.
Failed to install sdl2-1.1.0
cabal: Error: some packages failed to install:
sdl2-1.1.0 failed during the configure step. The exception was:
ExitFailure 1

I don't understand. According to Hackage, sdl2 is at version 1.1, but installing it requires version 2.0.3? I've tried this in and out of a sandbox. Results of ghc-pkg list are here if you think they're relevant: http://pastebin.com/tFrsfPFe

I'm on Ubuntu btw.

Help?

解决方案

Another thing which could happen (happened to me) for other installs is that the PKG_CONFIG_PATH variable might not point to the package config file (sdl2.pc, for me in the /usr/local/lib/pkgconfig directory). pkg-config uses some default directories ('/usr/lib/pkgconfig' and '/usr/share/pkgconfig'), but if the sdl.pc file isn't in one of these, you'll have to specify the directory in the environment variable. You can check this with echo $PKG_CONFIG_PATH

If it turns out you need to set the variable, just use export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig (or to whatever directory your sdl2.pc file lives in)

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