E:\src>cabal install pugs
Resolving dependencies...
Configuring pugs-compat-0.0.6.20120717.204800...
Building pugs-compat-0.0.6.20120717.204800...
Preprocessing library pugs-compat-0.0.6.20120717.204800...

src\Pugs\Compat\Posix.hs:134:8:
    Could not find module `IO'
    It is a member of the hidden package `haskell98-2.0.0.1'.
    Perhaps you need to add `haskell98' to the build-depends in your .cabal file
.
    Use -v to see a list of the files searched for.
cabal: Error: some packages failed to install:
Pugs-6.2.13.20120717 depends on pugs-compat-0.0.6.20120717.204800 which failed
to install.
pugs-compat-0.0.6.20120717.204800 failed during the building phase. The
exception was:
ExitFailure 1

E:\src>