Following your instruction, I started over installation as the following:<br _moz_dirty="" />
cd ~/fftw-3.2.2<br _moz_dirty="" />
./configure --enable-float --enable-sse --enable-shared<br _moz_dirty="" />
make<br _moz_dirty="" />
make install <br _moz_dirty="" />
cd ~gromacs-4.0.7<br _moz_dirty="" />
./configure --with-fft=fftw3 --without-x --enable-shared<br _moz_dirty="" />
error message:<br _moz_dirty="" />
checking size of void*... configure: error: cannot compute sizeof (void*)<br _moz_dirty="" />
See attached `config.log' for more details<br _moz_dirty="" />
<br _moz_dirty="" />
Thank you for your help.<br _moz_dirty="" />