ObjectIO install

The INSTALL file that comes with the objectIO files says that one must use the following commands to register the package: $ ghc-pkg -r objectio $ ghc-pkg -a objectio -f pckg.cfg The second command is not recognized as a valid one, and the ghc-pkg help appears showing the correct syntax. I needed to use $ ghc-pkg -a < pckg.cfg in order to get the package correctly registered. Am I missing something or is the INSTALL file wrong? -- Andre