Dear Lorenzo and Paolo, the QE versions I've used were compiled with following libraries/compilers: a) QE 6.0 compiler/intel/16.0 numlib/mkl/11.3.4 mpi/openmpi/2.0-intel-16.0 b) QE 6.1 compiler/intel/15.0.3 numlib/mkl/11.2.3 mpi/openmpi/2.0.3-intel fftw/3.3.6-pl2 Best regards Maxim Skripnik