Bug#844509: [openblas/custom build] please consider appending -march&-mtune parameters when building custom package

[lumin]

Package: libopenblas-base
Version: 0.2.19-1
Severity: minor

Hi,

BLAS is performance sensitive software, would you mind adding

  -march=native -mtune==native

to CFLAGS when building custom package with the debian source?

Thanks.