Issue #15392: Install idlelib/idle_test.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index cf75650..0439193 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -939,7 +939,8 @@
logging bsddb bsddb/test csv importlib wsgiref \
lib2to3 lib2to3/fixes lib2to3/pgen2 lib2to3/tests \
lib2to3/tests/data lib2to3/tests/data/fixers lib2to3/tests/data/fixers/myfixes \
- ctypes ctypes/test ctypes/macholib idlelib idlelib/Icons \
+ ctypes ctypes/test ctypes/macholib \
+ idlelib idlelib/Icons idlelib/idle_test \
distutils distutils/command distutils/tests $(XMLLIBSUBDIRS) \
multiprocessing multiprocessing/dummy \
unittest unittest/test \