gistfile1.txt

void set_threads(){
    #ifdef SCSL
        openblas_set_num_threads(1);
    #elifdef SCPL
        openblas_set_num_threads(num_threads());
    #elifdef PCSL
        openblas_set_num_threads(1);
    #else
        _Static_assert (0, "you did not pass appropriate compiler flags. Make sure that either SCSL, SCPL or PCSL is set.");
    #endif
}

gistfile2.txt

-DSCPL=1