`tested-with' in package

Who knows, please, what is the matter with the `tested-with' field in a package specification in ghc-6.4 ? Among the attempts tested-with: ghc-6.4, 5.02 tested-with: ghc-6.4 tested-with: GHC-6.4 tested-with: "GHC-6.4" tested-with: ghc tested-with: GHC only the last one satisfies the `configure' command runghc Setup.hs configire --ghc Other variants yield " Line 12: Parse of field 'tested-with' failed. " Thank you in advance for explanation. ----------------- Serge Mechveliani mechvel@botik.ru