Issue #19019: Change the OS X installer build script to use CFLAGS instead
of OPT for special build options.  By setting OPT, some compiler-specific
options like -fwrapv were overridden and thus not used, which could result
in broken interpreters when building with clang.
diff --git a/Misc/NEWS b/Misc/NEWS
index 5636796..3b98031 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -289,6 +289,11 @@
   problems in the Apple-supplied Tcl/Tk 8.5 shipped in OS X 10.6
   and later releases.
 
+- Issue #19019: Change the OS X installer build script to use CFLAGS instead
+  of OPT for special build options.  By setting OPT, some compiler-specific
+  options like -fwrapv were overridden and thus not used, which could result
+  in broken interpreters when building with clang.
+
 IDLE
 ----