The libraries are divided into several packages. The available packages are:

base

This package contains the Prelude and its support libraries, and a large collection of useful libraries ranging from data structures to parsing combinators and debugging utilities.

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 (http://cvs.haskell.org/Hugs/pages/libstatus.html). All those modules are always available.

Nhc98

Nhc98 provides many of the modules in the above packages (see the Nhc98 libraries page (http://www.haskell.org/nhc98/libraries.html) 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.