$ ghc-pkg check
Warning: haddock-interfaces: /usr/local/Cellar/cabal-install/0.14.0/share/doc/random-1.0.1.1/html/random.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/Cellar/cabal-install/0.14.0/share/doc/random-1.0.1.1/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/Cellar/cabal-install/0.14.0/share/doc/zlib-0.5.3.3/html/zlib.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/Cellar/cabal-install/0.14.0/share/doc/zlib-0.5.3.3/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/Cellar/cabal-install/0.14.0/share/doc/HTTP-4000.2.3/html/HTTP.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/Cellar/cabal-install/0.14.0/share/doc/HTTP-4000.2.3/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/Cellar/cabal-install/0.14.0/share/doc/network-2.3.0.11/html/network.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/Cellar/cabal-install/0.14.0/share/doc/network-2.3.0.11/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/Cellar/cabal-install/0.14.0/share/doc/parsec-3.1.2/html/parsec.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/Cellar/cabal-install/0.14.0/share/doc/parsec-3.1.2/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/Cellar/cabal-install/0.14.0/share/doc/text-0.11.2.0/html/text.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/Cellar/cabal-install/0.14.0/share/doc/text-0.11.2.0/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/Cellar/cabal-install/0.14.0/share/doc/mtl-2.1/html/mtl.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/Cellar/cabal-install/0.14.0/share/doc/mtl-2.1/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/Cellar/cabal-install/0.14.0/share/doc/transformers-0.3.0.0/html/transformers.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/Cellar/cabal-install/0.14.0/share/doc/transformers-0.3.0.0/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/share/doc/haddock-2.10.0/html/haddock.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/share/doc/haddock-2.10.0/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/share/doc/xhtml-3000.2.0.5/html/xhtml.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/share/doc/xhtml-3000.2.0.5/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/share/doc/ghc-paths-0.1.0.8/html/ghc-paths.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/share/doc/ghc-paths-0.1.0.8/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/share/doc/mtl-2.1.1/html/mtl.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/share/doc/mtl-2.1.1/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/share/doc/transformers-0.3.0.0/html/transformers.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/share/doc/transformers-0.3.0.0/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/share/doc/QuickCheck-2.4.2/html/QuickCheck.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/share/doc/QuickCheck-2.4.2/html doesn't exist or isn't a directory
Warning: haddock-interfaces: /usr/local/share/doc/random-1.0.1.1/html/random.haddock doesn't exist or isn't a file
Warning: haddock-html: /usr/local/share/doc/random-1.0.1.1/html doesn't exist or isn't a directory