úÎÅb/A list of all possible operating system types. Any sufficiently " Unix-like" system. #Some version of Microsoft Windows. <The type of operating system under which we are running (or  ! if this could not be detected).  The name of the compiler (e.g., "GHC"), or  if  this could not be detected. .The numerical version string for the compiler  (e.g., "6.10.2"), or  if this could not be detected.   AC-BuildPlatform-1.0.0System.PlatformOS_TypeUnix MS_Windowsos_type compiler_namecompiler_versionbase Data.MaybeNothing