but it also removes any subdirectories containing different git
trees (which only unusual packages are likely to create).
.TP
+.BR --clean=check " | " -wn
+Merely check that the tree is clean (does not contain uncommitted
+files), before building a source package.
+.TP
.BR --clean=none " | " -wn
Do not clean the tree before building a source package. If there are
files which are not in git, or if the build creates such files, a