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-rw-r--r--var/spack/repos/builtin/packages/boost/package.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/var/spack/repos/builtin/packages/boost/package.py b/var/spack/repos/builtin/packages/boost/package.py
index faeb3935ad..d416666699 100644
--- a/var/spack/repos/builtin/packages/boost/package.py
+++ b/var/spack/repos/builtin/packages/boost/package.py
@@ -178,6 +178,7 @@ class Boost(Package):
conditional("17", when="@1.63.0:"),
# C++20/2a is not support by Boost < 1.73.0
conditional("2a", when="@1.73.0:"),
+ conditional("20", when="@1.77.0:"),
),
multi=False,
description="Use the specified C++ standard when building.",