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--- a/src/adios4dolfinx/__init__.py
+++ b/src/adios4dolfinx/__init__.py
@@ -6,6 +6,16 @@
"""Top-level package for ADIOS2Wrappers."""
+# Debian ships python3-adios2-serial and python3-adios2-mpi
+# with the mpi build being used if the code is run under mpirun -n N python3 file.py
+# regardless of the value of N (be it 1 or > 1).
+# If the user runs instead python3 file.py, the serial build will be imported.
+# Since adios4dolfinx always requires the mpi build, we will set an environment
+# variable to force it over the serial one, regardless of how the user run the code.
+import os
+os.environ["ADIOS2_ALWAYS_USE_MPI"] = "1"
+del os
+
from importlib.metadata import metadata
from .checkpointing import (
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