Manually remove $(BUILT_SOURCES) since no-dist-built-sources doesnt work
diff --git a/lib/perl/t/Makefile.am b/lib/perl/t/Makefile.am
index de03971..7e9d8a0 100644
--- a/lib/perl/t/Makefile.am
+++ b/lib/perl/t/Makefile.am
@@ -17,4 +17,7 @@
 # under the License.
 #
 
+distdir:
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
 EXTRA_DIST = memory_buffer.t processor.t multiplex.t