dpkg-shlibdeps: warning: symbol [...] found in none of the libraries

In build output:

dpkg-shlibdeps: warning: debian/libxenmisc4.11/usr/lib/xen-4.11/lib/x86_64-linux-gnu/libfsimage.so contains an unresolvable reference to symbol dlsym: it's probably a plugin

dpkg-shlibdeps: warning: 2 other similar warnings have been skipped (use -v to see them all)

dpkg-shlibdeps: warning: symbol xtl_createlogger_stdiostream used by debian/libxenmisc4.11/usr/lib/x86_64-linux-gnu/libxenguest.so.4.11.0 found in none of the libraries

dpkg-shlibdeps: warning: symbol xencall1 used by debian/libxenmisc4.11/usr/lib/x86_64-linux-gnu/libxenguest.so.4.11.0 found in none of the libraries

dpkg-shlibdeps: warning: symbol xenforeignmemory_map used by debian/libxenmisc4.11/usr/lib/x86_64-linux-gnu/libxenguest.so.4.11.0 found in none of the libraries

dpkg-shlibdeps: warning: symbol xenforeignmemory_unmap used by debian/libxenmisc4.11/usr/lib/x86_64-linux-gnu/libxenguest.so.4.11.0 found in none of the libraries

dpkg-shlibdeps: warning: symbol xtl_logv used by debian/libxenmisc4.11/usr/lib/x86_64-linux-gnu/libxenguest.so.4.11.0 found in none of the libraries