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-rw-r--r--etc/spack/defaults/concretizer.yaml6
1 files changed, 6 insertions, 0 deletions
diff --git a/etc/spack/defaults/concretizer.yaml b/etc/spack/defaults/concretizer.yaml
index 643107d3c0..7311354c28 100644
--- a/etc/spack/defaults/concretizer.yaml
+++ b/etc/spack/defaults/concretizer.yaml
@@ -28,3 +28,9 @@ concretizer:
# instance concretize with target "icelake" while running on "haswell").
# If "true" only allow targets that are compatible with the host.
host_compatible: true
+ # When "true" concretize root specs of environments together, so that each unique
+ # package in an environment corresponds to one concrete spec. This ensures
+ # environments can always be activated. When "false" perform concretization separately
+ # on each root spec, allowing different versions and variants of the same package in
+ # an environment.
+ unify: false \ No newline at end of file