Fix lintian error about use of -$(MAKE)

diff --git a/debian/rules b/debian/rules
index c0d750f..4e0717a 100755 (executable)
--- a/debian/rules
+++ b/debian/rules
@@ -50,7 +50,7 @@ clean:
        dh_testdir
        dh_testroot
        rm -f build-stamp configure-stamp
-       -$(MAKE) distclean
+       [ ! -f Makefile ] || $(MAKE) distclean
        rm -f config.log
        dh_clean
        dpatch deapply-all