Passed as 'flags' parameter to get_ida_subdirs() 
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#define  | IDA_SUBDIR_IDP   0x0001 | 
|   | append the processor name as a subdirectory 
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#define  | IDA_SUBDIR_IDADIR_FIRST   0x0002 | 
|   | $IDADIR/subdir will be first, not last 
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#define  | IDA_SUBDIR_ONLY_EXISTING   0x0004 | 
|   | only existing directories will be present 
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