I Could Compile QE with Gfortran (Last version) but many examples were failing by Seg. Err. When I used internal FFTW instead of FFTW3 (justby replacing _FFTW3 with _FFTW in make.sys) problem has now solved. It seems that there are kind of incompatablities between FFTW3 with QE or I dont know the exact reason. Regards, ROOZBEH SANAEI