/usr/lib/dx/lib_linux/libDXcallm.a is in libdx4-dev 1:4.4.4-4build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/dx/lib_linux/../../libDXcallm.a
/usr/lib/dx/lib_linux/../../libDXcallm.a