Issue #16991: Add a C implementation of collections.OrderedDict.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 5db048a..ce2c0aa2 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -437,6 +437,7 @@
 		Objects/listobject.o \
 		Objects/longobject.o \
 		Objects/dictobject.o \
+		Objects/odictobject.o \
 		Objects/memoryobject.o \
 		Objects/methodobject.o \
 		Objects/moduleobject.o \