Problems configuring Makevars.win since R 3.6.0

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Thanks for the quick response. Following the instructions on the page you linked, I updated the Makevars to:

CXX14=$(BINPREF)g++ -O2 -march=native -mtune=native
CXX14FLAGS=-O3 -march=native -mtune=native
CXX11FLAGS=-O3 -march=native -mtune=native

This allowed me to run a model that I know worked previously. It completed in around 580 seconds.
Then I tried again after removing -O2 and it completed again in around 580 seconds.

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