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jcfr authored
These variables can be used when configuring extension external projects in two different scenarios: (1) bundled extensions and (2) regular extensions. This commit adds comments explaining the two scenarios and ensures external projects that are both associated with bundled extensions and using these variables are properly configured. git-svn-id: http://svn.slicer.org/Slicer4/trunk@27390 3bd1e089-480b-0410-8dfb-8563597acbee
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