It seems to work when I replace $(_DOC_OMF_DB) : $(_DOC_OMF_IN) with $(_DOC_OMF_DB) : deja-dup.omf.in
It seems to work when I replace $(_DOC_OMF_DB) : $(_DOC_OMF_IN) with $(_DOC_OMF_DB) : deja-dup.omf.in