我已经安装了 Haskell Platform 2012.4.0.0,我想试试 unittyped 包。
当我尝试安装它时,cabal-dev -s some-dir install unittyped
我收到了错误:
$ cabal-dev -s some-dir install unittyped
Resolving dependencies...
cabal: Could not resolve dependencies:
trying: unittyped-0.1 (user goal)
next goal: base (dependency of unittyped-0.1)
rejecting: base-3.0.3.2, 3.0.3.1 (global constraint requires installed
instance)
rejecting: base-4.5.1.0/installed-724... (conflict: unittyped => base>=4.6 && <4.7)
rejecting: base-4.6.0.0, 4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0,
4.2.0.2, 4.2.0.1, 4.2.0.0, 4.1.0.0, 4.0.0.0 (global constraint requires installed instance)
并cabal-dev -s some-dir install base-4.6.0.0
产生类似的消息。
有没有办法克服这些错误?