Not able to run Eight Schools example on rstan 2.21.1 & StanHeaders 2.21.0-5

Interfaces RStan
17

Can you try setting all of these to

CXX14FLAGS=-O3 -mtune=native -mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 
CXX11FLAGS=-O3 -mtune=native -mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2

so to avoid the march thing? Apparently there have been issues reported with the minnow compiler and turning on march. Does this resolve the issue?

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