-defvalopt '--since-version', '-v', '[^_]+|_', sub {
- ($changes_since_version) = @_;
-};
+defvalopt '--since-version', '-v', '[^_]+|_', \$changes_since_version;
+defvalopt '--distro', '-d', '.+', \$idistro;
+defvalopt '--existing-package', '', '.*', \$existing_package;