+defvalopt '--build-products-dir','','.*', \$buildproductsdir;
+defvalopt '--clean', '', $cleanmode_re, \$cleanmode;
+defvalopt '--quilt', '', $quilt_modes_re, \$quilt_mode;
+
+defvalopt '', '-c', '.*=.*', sub { push @git, '-c', @_; };
+
+defvalopt '', '-C', '.+', sub {
+ ($changesfile) = (@_);
+ if ($changesfile =~ s#^(.*)/##) {
+ $buildproductsdir = $1;
+ }
+};