我的ghc安装已经过时，所以我决定重新安装ghc和cabal，希望能解决一些问题。我开始执行here步骤。 GHC现在是版本7.8.3。
然后我删除了〜/ .cabal并尝试使用这些步骤进行安装但是失败了。所以我再次删除了.cabal并尝试了here步骤但是当我运行sh bootstrap.sh时，它会遇到缺少的模块：
Using local tarball for parsec-3.1.6.
[1 of 1] Compiling Main ( Setup.hs, Setup.o )
Linking Setup ...
Configuring parsec-3.1.6...
Building parsec-3.1.6...
Preprocessing library parsec-3.1.6...
Text/Parsec/Prim.hs:80:8:
Could not find module ‘Control.Monad.Trans’
There are files missing in the ‘mtl-2.2.1’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
Text/Parsec/Prim.hs:81:8:
Could not find module ‘Control.Monad.Identity’
There are files missing in the ‘mtl-2.2.1’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
Text/Parsec/Prim.hs:83:8:
Could not find module ‘Control.Monad.Reader.Class’
There are files missing in the ‘mtl-2.2.1’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
Text/Parsec/Prim.hs:84:8:
Could not find module ‘Control.Monad.State.Class’
There are files missing in the ‘mtl-2.2.1’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
Text/Parsec/Prim.hs:85:8:
Could not find module ‘Control.Monad.Cont.Class’
There are files missing in the ‘mtl-2.2.1’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
Text/Parsec/Prim.hs:86:8:
Could not find module ‘Control.Monad.Error.Class’
There are files missing in the ‘mtl-2.2.1’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
Text/Parsec/Text.hs:19:18:
Could not find module ‘Data.Text’
There are files missing in the ‘text-1.2.0.0’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
Text/Parsec/Text/Lazy.hs:19:18:
Could not find module ‘Data.Text.Lazy’
There are files missing in the ‘text-1.2.0.0’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
Error during cabal-install bootstrap:
Building the parsec package failed.
当我运行ghc-pkg check时，我得到了很多这样的东西：
cannot find any of ["libHSOpenGLRaw-1.5.0.0.a","libHSOpenGLRaw-1.5.0.0.p_a","libHSOpenGLRaw-1.5.0.0-ghc7.8.3.so","libHSOpenGLRaw-1.5.0.0-ghc7.8.3.dylib","HSOpenGLRaw-1.5.0.0-ghc7.8.3.dll"] on library path
Warning: haddock-interfaces: /usr/local/share/doc/x86_64-linux-ghc-7.8.3/Cabal-1.21.1.0/html/Cabal.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/share/doc/x86_64-linux-ghc-7.8.3/Cabal-1.21.1.0/html doesn't exist or isn't a directory
然后这个：
The following packages are broken, either because they have a problem
listed above, or because they depend on a broken package.
text-1.1.0.1
Cabal-1.20.0.2
zlib-0.5.4.1
contravariant-1.2
void-0.6.1
netwire-5.0.0
semigroups-0.15.3
unordered-containers-0.2.5.0
transformers-compat-0.3.3.4
exceptions-0.6.1
MonadRandom-0.3
mtl-2.2.1
transformers-0.4.1.0
cpphs-1.18.5
polyparse-1.9
nats-0.2
hashable-1.2.2.0
OpenGL-2.9.2.0
text-1.2.0.0
tagged-0.7.2
stb-image-0.2.1
split-0.2.2
reflection-1.5.1
random-1.0.1.1
primitive-0.5.3.0
prelude-extras-0.4
parallel-3.2.0.4
bitmap-0.0.2
bindings-DSL-1.0.21
GLURaw-1.4.0.1
OpenGLRaw-1.5.0.0
答案 0 :(得分：8)
您可以在每个损坏的软件包上使用ghc-pkg unregister来正确清理它们，或者可能会吹走整个~/.ghc文件夹并重新开始。您可能需要使用--force以避免必须遵守包的依赖顺序。
答案 1 :(得分：3)
当您删除〜/ .cabal时是否还删除了〜/ .ghc？如果没有，我建议你尝试一下，因为如果我理解正确，第一个可能包含对第二个安装包的引用。