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-rw-r--r--lib/spack/spack/solver/concretize.lp3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/spack/spack/solver/concretize.lp b/lib/spack/spack/solver/concretize.lp
index fd98aa92f3..32a84e6d5e 100644
--- a/lib/spack/spack/solver/concretize.lp
+++ b/lib/spack/spack/solver/concretize.lp
@@ -572,6 +572,9 @@ os_compatible(OS, OS) :- os(OS).
% catalina binaries can be used on bigsur. Direction is package -> dependency.
os_compatible("bigsur", "catalina").
+% If an OS is set explicitly respect the value
+node_os(Package, OS) :- node_os_set(Package, OS), node(Package).
+
#defined node_os_set/2.
#defined os_compatible/2.