Implementation-specific notes: [GHC\/GHCi] Most of the time, all the packages are available without the need to use any additional command-line options. The only time when this is not the case is when linking a program on the command line, without using the @--make@ option: in this case you must list all the packages to link to by adding the @-package@ /P/ flag (where /P/ is the package name) to the command line for each package. See the User's Guide (<../users_guide/index.html>) for more details. [Hugs] Hugs provides almost all of the modules in the above packages, with exceptions listed on the Hugs 98 libraries status page (). All those modules are always available. [Nhc98] Nhc98 provides many of the modules in the above packages (see the Nhc98 libraries page () for a more details). The modules of the @haskell98@ package are available without the need to use any additional compile-time options. To use modules from some other package /P/ with Nhc98, add the compile-time option @-package@ /P/.