diff --git a/Misc/ACKS b/Misc/ACKS
index 900fae7..de5410c 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -550,6 +550,7 @@
 Robert Lehmann
 Petri Lehtinen
 Luke Kenneth Casson Leighton
+Tshepang Lekhonkhobe
 Marc-Andre Lemburg
 John Lenton
 Christopher Tur Lesniewski-Laas
diff --git a/Misc/NEWS b/Misc/NEWS
index 772eef9..e94b77c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -187,6 +187,10 @@
 Library
 -------
 
+- Issue #12246: Warn and fail when trying to install a third-party project from
+  an uninstalled Python (built in a source checkout).  Original patch by
+  Tshepang Lekhonkhobe.
+
 - Issue #11583: Speed up os.path.isdir on Windows by using GetFileAttributes
   instead of os.stat.