库“rt”和“dl”在西格温
也许这很愚蠢，但我无法找出必须在 Cygwin 中安装哪个软件包来修复以下丢失的库：
config.status: creating unix.buildinfo config.status: creating include/HsUnixConfig.h cabal.exe: Missing dependencies on foreign libraries: * Missing header file: HsUnix.h * Missing C libraries: rt, dl
任何想法或者当您收到文件 xxx 丢失的反馈时，您通常如何找出要安装的软件包（我记得在gentoo中这非常简单）...
Perhaps this is stupid but I'm unable to find out which package I have to install in Cygwin to fix the following missing libraries:
config.status: creating unix.buildinfo config.status: creating include/HsUnixConfig.h cabal.exe: Missing dependencies on foreign libraries: * Missing header file: HsUnix.h * Missing C libraries: rt, dl
Any ideas or how do you generally find out which package to install when you get feedback that file xxx is missing (I remember that in gentoo this was quite straightforward)...
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我一直遇到这个问题，我刚刚发现了这个。
http://www.haskell.org/haskellwiki/Windows#Tools_for_compilation
I have been having this problem and I just found this.
http://www.haskell.org/haskellwiki/Windows#Tools_for_compilation
在“奇怪”的系统上，librt 和 libdl 是由 libc 直接提供的，我们无法直接链接到它们。
unix 库最近有一个补丁可以解决这个问题：
https://ghc.haskell.org/trac/ghc/ticket/8713
https://github.com/haskell/unix/pull/8
也就是说，这个可能不足以让您在 cygwin 上安装 UNIX - 多年来，它被认为只是“那么就不要这样做”的情况（即，如果您想在 Windows 上运行，将其移植为使用 Windows 库中的适当函数，如果您想同时使用两者，则使用 CPP）。
On "weird" systems, librt and libdl are provided by libc directly and we can't link to them directly.
There was a recent patch to the unix library that should address this:
https://ghc.haskell.org/trac/ghc/ticket/8713
https://github.com/haskell/unix/pull/8
That said, this may not be sufficient to let you install
unixoncygwin-- for years it was considered simply a case of "don't do that then" (i.e. if you want to run on windows, port it to use the appropriate functions from the windows libraries instead, and if you want to use both then use CPP).