/usr/include/gdcm-2.6/gdcmjpeg/ is in libgdcm2-dev 2.6.3-3ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gdcm-2.6/gdcmjpeg/12/
/usr/include/gdcm-2.6/gdcmjpeg/12/jconfig.h
/usr/include/gdcm-2.6/gdcmjpeg/12/jerror.h
/usr/include/gdcm-2.6/gdcmjpeg/12/jinclude.h
/usr/include/gdcm-2.6/gdcmjpeg/12/jmorecfg.h
/usr/include/gdcm-2.6/gdcmjpeg/12/jpegcmake.h
/usr/include/gdcm-2.6/gdcmjpeg/12/jpeglib.h
/usr/include/gdcm-2.6/gdcmjpeg/12/mangle_jpeg12bits.h
/usr/include/gdcm-2.6/gdcmjpeg/16/
/usr/include/gdcm-2.6/gdcmjpeg/16/jconfig.h
/usr/include/gdcm-2.6/gdcmjpeg/16/jerror.h
/usr/include/gdcm-2.6/gdcmjpeg/16/jinclude.h
/usr/include/gdcm-2.6/gdcmjpeg/16/jmorecfg.h
/usr/include/gdcm-2.6/gdcmjpeg/16/jpegcmake.h
/usr/include/gdcm-2.6/gdcmjpeg/16/jpeglib.h
/usr/include/gdcm-2.6/gdcmjpeg/16/mangle_jpeg16bits.h
/usr/include/gdcm-2.6/gdcmjpeg/8/
/usr/include/gdcm-2.6/gdcmjpeg/8/jconfig.h
/usr/include/gdcm-2.6/gdcmjpeg/8/jerror.h
/usr/include/gdcm-2.6/gdcmjpeg/8/jinclude.h
/usr/include/gdcm-2.6/gdcmjpeg/8/jmorecfg.h
/usr/include/gdcm-2.6/gdcmjpeg/8/jpegcmake.h
/usr/include/gdcm-2.6/gdcmjpeg/8/jpeglib.h
/usr/include/gdcm-2.6/gdcmjpeg/8/mangle_jpeg8bits.h
/usr/include/gdcm-2.6/gdcmjpeg/jchuff.h
/usr/include/gdcm-2.6/gdcmjpeg/jconfig.h
/usr/include/gdcm-2.6/gdcmjpeg/jdct.h
/usr/include/gdcm-2.6/gdcmjpeg/jdhuff.h
/usr/include/gdcm-2.6/gdcmjpeg/jerror.h
/usr/include/gdcm-2.6/gdcmjpeg/jinclude.h
/usr/include/gdcm-2.6/gdcmjpeg/jlossls.h
/usr/include/gdcm-2.6/gdcmjpeg/jlossy.h
/usr/include/gdcm-2.6/gdcmjpeg/jmemsys.h
/usr/include/gdcm-2.6/gdcmjpeg/jmorecfg.h
/usr/include/gdcm-2.6/gdcmjpeg/jpegint.h
/usr/include/gdcm-2.6/gdcmjpeg/jpeglib.h
/usr/include/gdcm-2.6/gdcmjpeg/jversion.h