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Problem
When setting the PYHELICS_INSTALL environment variable, the setup.py will still attempt to download or build the HELICS binaries.
Expected Outcome
When setting PYHELICS_INSTALL, the setup.py should respect this and not proceed with downloading or building HELICS into
./helics/
.Solution
Respect the PYHELICS_INSTALL environment variable as described in https://python.helics.org/installation/ by setting the PYHELICS_INSTALL variable in setup.py to the environment variable
PYHELICS_INSTALL
if set, otherwise set to a default path of./helics
as previously set in the setup.py before.