/usr/lib/x86_64-linux-gnu/ is in libgdcm2-dev 2.6.3-3ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/gdcm-2.6/
/usr/lib/x86_64-linux-gnu/gdcm-2.6/GDCMConfig.cmake
/usr/lib/x86_64-linux-gnu/gdcm-2.6/GDCMTargets-none.cmake
/usr/lib/x86_64-linux-gnu/gdcm-2.6/UseGDCM.cmake
/usr/lib/x86_64-linux-gnu/gdcm-2.6/GDCMTargets.cmake
/usr/lib/x86_64-linux-gnu/gdcm-2.6/GDCMConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/libgdcmjpeg12.so
/usr/lib/x86_64-linux-gnu/libgdcmCommon.so
/usr/lib/x86_64-linux-gnu/libgdcmjpeg16.so
/usr/lib/x86_64-linux-gnu/libgdcmDSED.so
/usr/lib/x86_64-linux-gnu/libgdcmDICT.so
/usr/lib/x86_64-linux-gnu/libgdcmIOD.so
/usr/lib/x86_64-linux-gnu/libgdcmMSFF.so
/usr/lib/x86_64-linux-gnu/libgdcmjpeg8.so
/usr/lib/x86_64-linux-gnu/libgdcmMEXD.so