haskell - 导入 Haskell 库，如 System.Random

Question

所以我一直在搜索和搜索如何解决这个问题，但我一直没有找到解决方法。

首先，我想将 System.Random 导入到我的 Haskell 程序中。

import System.Random

不幸的是，这并不是那么容易......当我在 ghci 中执行程序时，它返回的是:

Could not find module `System.Random'
Use -v to see a list of the files searched for.

所以很明显我按照它说的做了......同样的问题除了我看到它使用的是什么包数据库:

Using binary package database: /usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/package.conf.d/package.cache

我进入那个目录，惊讶地发现……我的随机包不在那里。我转到我的 .cabal/packages 并将我的 random-1.0.1.1 文件复制到

/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/

其他包所在的目录。我再次运行程序，仍然得到同样的错误。当我查看 ghc-7.6.3/package.conf.d 时，我意识到没有文件指向 lib 中的随机文件。

我该怎么办？？

我很绝望。如何安装包!!!

---

我也试过 cabal install 但我得到了一个巨大的错误:

Failed to install random-1.0.1.1
Last 10 lines of the build log ( /Users/mikeecb/.cabal/logs/random-1.0.1.1.log ):
cabal: Error: some packages failed to install:
random-1.0.1.1 failed during the configure step. The exception was:
user error (In file included from
/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/Rts.h:30,

from
/var/folders/lw/mwgzrbns2j10_p75xtydr9_r0000gn/T/ghc3806_0/ghc3806_0.c:1:0:


/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/Stg.h:65:18:
error: math.h: No such file or directory
In file included from
/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/Rts.h:32,

from
/var/folders/lw/mwgzrbns2j10_p75xtydr9_r0000gn/T/ghc3806_0/ghc3806_0.c:1:0:


/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/HsFFI.h:30:20:
error: stdint.h: No such file or directory

In file included from
/var/folders/lw/mwgzrbns2j10_p75xtydr9_r0000gn/T/ghc3806_0/ghc3806_0.c:1:0:


/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/Rts.h:190:20:
error: stdlib.h: No such file or directory
In file included from
/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/Rts.h:227,

from
/var/folders/lw/mwgzrbns2j10_p75xtydr9_r0000gn/T/ghc3806_0/ghc3806_0.c:1:0:


/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/rts/Flags.h:17:19:
error: stdio.h: No such file or directory
In file included from
/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/Rts.h:227,

from
/var/folders/lw/mwgzrbns2j10_p75xtydr9_r0000gn/T/ghc3806_0/ghc3806_0.c:1:0:


/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/rts/Flags.h:22:0:
error: expected specifier-qualifier-list before ‘FILE’

/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/rts/Flags.h:188:0:
error: expected specifier-qualifier-list before ‘FILE’
In file included from
/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/Rts.h:234,

from
/var/folders/lw/mwgzrbns2j10_p75xtydr9_r0000gn/T/ghc3806_0/ghc3806_0.c:1:0:


/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/rts/Threads.h:19:23:
error: sys/types.h: No such file or directory
In file included from
/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/Rts.h:234,

from
/var/folders/lw/mwgzrbns2j10_p75xtydr9_r0000gn/T/ghc3806_0/ghc3806_0.c:1:0:


/usr/local/Cellar/ghc/7.6.3/lib/ghc-7.6.3/include/rts/Threads.h:49:0:
error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘forkProcess’
)

Answer 1

所以看起来是从 Haskell Platform 卸载然后重新安装 GHC对于 Mac OSX，它可以正常工作。