In /usr/bin/dpkg-realpath line 26:
. "$PKGDATADIR/sh/dpkg-error.sh"
  ^----------------------------^ SC1090: Can't follow non-constant source. Use a directive to specify location.


In /usr/bin/dpkg-realpath line 52:
  local src="$1"
  ^-------^ SC2039: In POSIX sh, 'local' is undefined.


In /usr/bin/dpkg-realpath line 53:
  local root="$DPKG_ROOT"
  ^--------^ SC2039: In POSIX sh, 'local' is undefined.


In /usr/bin/dpkg-realpath line 54:
  local loop=0
  ^--------^ SC2039: In POSIX sh, 'local' is undefined.


In /usr/bin/dpkg-realpath line 55:
  local result="$root"
  ^----------^ SC2039: In POSIX sh, 'local' is undefined.


In /usr/bin/dpkg-realpath line 56:
  local dst
  ^-------^ SC2039: In POSIX sh, 'local' is undefined.

For more information:
  https://www.shellcheck.net/wiki/SC1090 -- Can't follow non-constant source....
  https://www.shellcheck.net/wiki/SC2039 -- In POSIX sh, 'local' is undefined.