qiskit/releasenotes/notes/0.15/remove-use_networkx-e1c846a...

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---
upgrade:
- |
Support for the use of the ``USE_RETWORKX`` environment variable which was
introduced in the 0.13.0 release to provide an optional fallback to the
legacy `networkx <https://networkx.github.io/>`__ based
:class:`qiskit.dagcircuit.DAGCircuit` implementation
has been removed. This flag was only intended as provide a relief valve
for any users that encountered a problem with the new implementation for
one release during the transition to retworkx.