--- third_party/python/virtualenv/virtualenv.py.orig	2021-02-01 22:20:21.000000000 -0600
+++ third_party/python/virtualenv/virtualenv.py	2021-02-01 22:28:31.000000000 -0600
@@ -1339,6 +1339,14 @@
                              "have Apple's development tools installed")
                 raise
 
+        # For macOS on arm64, the copied binary needs to be ad-hoc codesigned.
+
+        if os.uname()[4] == 'arm64':
+            codesign_cmd = ["codesign", "--sign", "-", "--force",
+                           "--preserve-metadata=entitlements,requirements,flags,runtime", py_executable]
+            subprocess.call(codesign_cmd)
+
+
     if not is_win:
         # Ensure that 'python', 'pythonX' and 'pythonX.Y' all exist
         py_exe_version_major = 'python%s' % sys.version_info[0]