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-rw-r--r--lib/spack/spack/solver/concretize.lp1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/spack/spack/solver/concretize.lp b/lib/spack/spack/solver/concretize.lp
index d706663aaa..22ba77142a 100644
--- a/lib/spack/spack/solver/concretize.lp
+++ b/lib/spack/spack/solver/concretize.lp
@@ -227,6 +227,7 @@ provider_weight(Package, 100)
provider(Package, Virtual),
not default_provider_preference(Virtual, Package, _).
+#defined possible_provider/2.
#defined provider_condition/3.
#defined required_provider_condition/3.
#defined required_provider_condition/4.