diff -ur portage-2.3.76_old/bin/install.py portage-2.3.76_new/bin/install.py
--- portage-2.3.76_old/bin/install.py	2019-09-12 05:06:38.000000000 +0300
+++ portage-2.3.76_new/bin/install.py	2019-11-07 18:14:04.080000000 +0200
@@ -112,8 +112,12 @@
 		dest="no_target_directory"
 	)
 	parser.add_argument(
-		"--context",
 		"-Z",
+		action="store_true",
+		dest="context"
+	)
+	parser.add_argument(
+		"--context",
 		action="store",
 		dest="context"
 	)