20923aed_Java_Build_Path_Libraries_tab_options__Description
[Option] Add Variable [Description] 
Allows you to add classpath variables to the build path. Classpath variables are an indirection to JARs with the benefit of avoiding local file system paths in a classpath. This is needed when projects are shared in a team. Variables can be created and edited in the Java > Build Path > Classpath Variables preference page.
Java Build Path
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