From beed6047e8dc1a5619b10c879a98dbfa24340ad8 Mon Sep 17 00:00:00 2001
From: Todd Gamblin <gamblin2@llnl.gov>
Date: Tue, 8 Jun 2021 03:07:34 -0700
Subject: macOS: add monterey as macOS version 12. (#24192)

---
 lib/spack/spack/operating_systems/mac_os.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/spack/spack/operating_systems/mac_os.py b/lib/spack/spack/operating_systems/mac_os.py
index de9bcf659d..0d5bc6cfe9 100644
--- a/lib/spack/spack/operating_systems/mac_os.py
+++ b/lib/spack/spack/operating_systems/mac_os.py
@@ -55,7 +55,8 @@ class MacOs(OperatingSystem):
             '10.14': 'mojave',
             '10.15': 'catalina',
             '10.16': 'bigsur',
-            '11':  'bigsur',
+            '11': 'bigsur',
+            '12': 'monterey',
         }
 
         # Big Sur versions go 11.0, 11.0.1, 11.1 (vs. prior versions that
-- 
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