- return """--host=x86_64-linux-gnu 'FCFLAGS=-O2 -std=legacy -fopenmp -g -fbounds-check -fbacktrace -ffpe-trap=invalid,zero,overflow,denormal -Wall -fPIC' 'CFLAGS=-O2 -fopenmp -fPIC' 'LDFLAGS=-fopenmp -fPIC' --with-mpi3=false"""
+ return """--host=x86_64-linux-gnu 'FCFLAGS=-O2 -std=legacy -fopenmp -g -fbounds-check -fbacktrace -ffpe-trap=invalid,zero,overflow,denormal -Wall -fPIC' 'CFLAGS=-O2 -fopenmp -fPIC' 'LDFLAGS=-fopenmp -fPIC' 'CXXFLAGS=-Wall -O2 -g -fPIC' --with-mpi3=false"""