A sequence can also run dependent targets in debian/rules. For
example, the "binary" sequence runs the "install" target.
-B<dh> sets environment variables listed by B<dpkg-buildflags>, unless
-they are already set. It supports DEB_BUILD_OPTIONS=noopt too.
-
B<dh> uses the B<DH_INTERNAL_OPTIONS> environment variable to pass information
through to debhelper commands that are run inside override targets. The
contents (and indeed, existence) of this environment variable, as the name