/usr/include/dcmtk/dcmfg/ is in libdcmtk-dev 3.6.2-3build3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dcmtk/dcmfg/fg.h
/usr/include/dcmtk/dcmfg/fgbase.h
/usr/include/dcmtk/dcmfg/fgdefine.h
/usr/include/dcmtk/dcmfg/fgderimg.h
/usr/include/dcmtk/dcmfg/fgfact.h
/usr/include/dcmtk/dcmfg/fgfracon.h
/usr/include/dcmtk/dcmfg/fgframeanatomy.h
/usr/include/dcmtk/dcmfg/fgframevoilut.h
/usr/include/dcmtk/dcmfg/fgidentpixeltransform.h
/usr/include/dcmtk/dcmfg/fgimagedatatype.h
/usr/include/dcmtk/dcmfg/fginterface.h
/usr/include/dcmtk/dcmfg/fgparametricmapframetype.h
/usr/include/dcmtk/dcmfg/fgpixmsr.h
/usr/include/dcmtk/dcmfg/fgplanor.h
/usr/include/dcmtk/dcmfg/fgplanorvol.h
/usr/include/dcmtk/dcmfg/fgplanpo.h
/usr/include/dcmtk/dcmfg/fgplanposvol.h
/usr/include/dcmtk/dcmfg/fgrealworldvaluemapping.h
/usr/include/dcmtk/dcmfg/fgseg.h
/usr/include/dcmtk/dcmfg/fgtypes.h
/usr/include/dcmtk/dcmfg/fgusimagedescription.h
/usr/include/dcmtk/dcmfg/stack.h
/usr/include/dcmtk/dcmfg/stackinterface.h