-useful flags including "-isp".
-
-Note that L<dpkg-gencontrol(1)> expands certian substirution variables
-when generating the control file (for details, see its man page). Those
-variables are typically generated by L<dh_shlibdeps(1)> and like programs.
-However, if you want to specify some of your own manually, you may do so,
-by creating files named debian/package.substvars (where package is the
-package these variables apply to). The files should be of the same form
-output by L<dpkg-shlibdeps(1)>