https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/linking-MKL-BLAS-with-gfortran/m-p/969409#M16448 If you use gfortran, you may have noticed that the g77-compiled blas library supplied in typical linux distros isn't compatible with gfortran. I ran some tests successfully with<BR />gfortran -O2 -march=nocona -L/opt/intel/mkl/8.0/lib/em64t *.f -lmkl_em64t -lguide -lpthread<BR />As expected, setenv OMP_NUM_THREADS=2 invokes parallel execution, where mkl so chooses. Mkl performance was the same, linked with ifort or with gfortran.<BR />lapack would have a problem, due to the run-time library differences between gfortran and ifort. Wed, 12 Oct 2005 22:50:14 GMT TimP 2005-10-12T22:50:14Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/linking-MKL-BLAS-with-gfortran/m-p/969409#M16448 If you use gfortran, you may have noticed that the g77-compiled blas library supplied in typical linux distros isn't compatible with gfortran. I ran some tests successfully with<BR />gfortran -O2 -march=nocona -L/opt/intel/mkl/8.0/lib/em64t *.f -lmkl_em64t -lguide -lpthread<BR />As expected, setenv OMP_NUM_THREADS=2 invokes parallel execution, where mkl so chooses. Mkl performance was the same, linked with ifort or with gfortran.<BR />lapack would have a problem, due to the run-time library differences between gfortran and ifort. Wed, 12 Oct 2005 22:50:14 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/linking-MKL-BLAS-with-gfortran/m-p/969409#M16448 TimP 2005-10-12T22:50:14Z