Note: This program is deprecated. You should use build dependencies
dh_testversion compares the version of debhelper against the version you
specify, and if the condition is not met, exits with an error message.
You can use this in your debian/rules files if a new debhelper feature is
introduced, and your package requires that feature to build correctly. Use
debhelper's changelog to figure out the version you need.
Be sure not to overuse dh_testversion. If debhelper version 9.5
introduces a new dh_autofixbugs command, and your package uses it, then if
someone tries to build it with debhelper 1.0, the build will fail anyway when
dh_autofixbugs cannot be found, so there is no need for you to use
Optional comparison operator used in comparing the versions. If not
specified, ``>='' is used. For descriptions of the comparison operators, see
Version number to compare against the current version of debhelper. If not
specified, dh_testversion does nothing.