Indicate your preferences for the User Libraries settings on the Java > Build Path > User Libraries preference page.
A user library is a set of JAR files. A user library can be added to a projects build path through the build path properties page. The User Libraries preference page allows to define, edit, import, export, or remove user libraries.
|New...||Creates a new user library|
|Edit...||Edits the currently selected library, JAR or JAR attribute|
|Add JARs...||Adds one or more JARs to the currently selected user library|
|Remove..||Removes the currently selected user library or JAR|
|Up||Moves the currently selected JAR up in the list of JARs of a user library. The order can be important if more than one JAR contain a type with the same qualified name.|
|Down||Moves the currently selected JAR down in the list of JARs of a user library. The order can be important if more than one JAR contain a type with the same qualified name.|
|Import...||Adds new libraries from an import file|
|Export...||Exports libraries to an import file|
Java Build Path page