我需要通过 Cabal 安装 Yesod 和依赖项，不幸的是我无法更新 cabal。外壳输出：
...$ sudo cabal install cabal-install
Resolving dependencies...
Configuring cabal-install-1.18.0.2...
/tmp/24453.c:1:12:
warning: control reaches end of non-void function [-Wreturn-type]
int foo() {}
^
1 warning generated.
Building cabal-install-1.18.0.2...
Preprocessing executable 'cabal' for cabal-install-1.18.0.2...
<command line>: cannot satisfy -package-id HTTP-4000.2.8-cdf033f9d7051824f52cd5101df67509
(use -v for more information)
Failed to install cabal-install-1.18.0.2
cabal: Error: some packages failed to install:
cabal-install-1.18.0.2 failed during the building phase. The exception was:
ExitFailure 1
任何人都知道如何解决它？对我来说没有什么真正有意义的。