/usr/include/ossim/parallel/ is in libossim-dev 1.8.16-4ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ossim/parallel/ossimIgen.h
/usr/include/ossim/parallel/ossimImageChainMtAdaptor.h
/usr/include/ossim/parallel/ossimImageHandlerMtAdaptor.h
/usr/include/ossim/parallel/ossimImageMpiMWriterSequenceConnection.h
/usr/include/ossim/parallel/ossimImageMpiSWriterSequenceConnection.h
/usr/include/ossim/parallel/ossimJob.h
/usr/include/ossim/parallel/ossimJobMultiThreadQueue.h
/usr/include/ossim/parallel/ossimJobQueue.h
/usr/include/ossim/parallel/ossimJobThreadQueue.h
/usr/include/ossim/parallel/ossimMpi.h
/usr/include/ossim/parallel/ossimMpiMasterOverviewSequencer.h
/usr/include/ossim/parallel/ossimMpiSlaveOverviewSequencer.h
/usr/include/ossim/parallel/ossimMtDebug.h
/usr/include/ossim/parallel/ossimMultiThreadSequencer.h
/usr/include/ossim/parallel/ossimOrthoIgen.h