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-rw-r--r--lib/spack/spack/solver/concretize.lp5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/spack/spack/solver/concretize.lp b/lib/spack/spack/solver/concretize.lp
index 7c14ac1f4f..1e7d0f66de 100644
--- a/lib/spack/spack/solver/concretize.lp
+++ b/lib/spack/spack/solver/concretize.lp
@@ -119,6 +119,11 @@ attr(Name, A1, A2, A3) :- impose(ID), imposed_constraint(ID, Name, A1, A2, A3).
variant_value(Package, Variant, Value),
not imposed_constraint(Hash, "variant_value", Package, Variant, Value).
+% we cannot have additional flag values when we are working with concrete specs
+:- node(Package), hash(Package, Hash),
+ node_flag(Package, FlagType, Flag),
+ not imposed_constraint(Hash, "node_flag", Package, FlagType, Flag).
+
#defined condition/2.
#defined condition_requirement/3.
#defined condition_requirement/4.