6100d80d_Run_Debug_Configuration__Maven__Description
[Item] Maven home directory [Description] 
Use this drop-down list to select a bundled Maven version that is available (for Maven2, version 2.2.1 and for Maven3, version 3.0.5) or the result of resolved system variables such as MAVEN_HOME or MAVEN2_HOME. You can also specify your own Maven version that is installed on your machine. You can click and select the necessary directory in the dialog that opens.
IntelliJ IDEA 14.1.0 Help :: Run/Debug Configuration: Maven