Add "concurrent" subdir to Makefile.

diff --git a/Makefile.pre.in b/Makefile.pre.in
index 6664ef10e8d81d8eebd36e0f4ad3cb52dc73ae17..294a03cd1523b94361cac840d1df7370edb618e1 100644 (file)
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -871,7 +871,7 @@ LIBSUBDIRS= tkinter tkinter/test tkinter/test/test_tkinter \
                 tkinter/test/test_ttk site-packages test \
                test/decimaltestdata test/xmltestdata \
                test/tracedmodules \
-               encodings \
+               concurrent encodings \
                email email/mime email/test email/test/data \
                html json json/tests http dbm xmlrpc \
                sqlite3 sqlite3/test \