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    Suggestion 
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    Resolution: Won't Do
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    P3: Somewhat important 
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    None
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    None
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    None
Allow rcc to use defined variables for substitution, especially in path names.
When referencing an external project, setting a -DSOMEPATH=/path/to/external/project/on/this/system,
then
<file>$SOMEPATH/resourcefile.png</file> expands out to /path/to/external/project/on/this/system/resourcefile.png