<div style="font-family: Arial, sans-serif; font-size: 14px;">Hello,</div><div style="font-family: Arial, sans-serif; font-size: 14px;"><br></div><div style="font-family: Arial, sans-serif; font-size: 14px;">This might be a generic question but I was hoping to get some help on installation of quantum espresso on my machine. I was not sure how to do ./configure properly (In the userguide it has an example of this: <span>./configure MPIF90=mpif90 FFLAGS="-O2 -assume byterecl" </span><span>CC=gcc CFLAGS=-O3 LDFLAGS=-static</span>). <br></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><br></div><div style="font-family: Arial, sans-serif; font-size: 14px;">I am confused about FFLAGS, CFLAGS and LDFLAGS. I don't have any idea about what they really mean.<br></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><br></div><div style="font-family: Arial, sans-serif; font-size: 14px;">I am on linux. I have following on my machine:</div><div style="font-family: Arial, sans-serif; font-size: 14px;"><br></div><div style="font-family: Arial, sans-serif; font-size: 14px;">Fortran Compiler: gfortran ver <span>4:12.2.0-3</span><br></div><div style="font-family: Arial, sans-serif; font-size: 14px;">BLAS: ver <span>3.11.0-2</span> (installed using apt install libblas-dev)</div><div style="font-family: Arial, sans-serif; font-size: 14px;">LAPACK: ver <span>3.11.0-2</span> ( installed using apt install liblapack-dev)</div><div style="font-family: Arial, sans-serif; font-size: 14px;">fftw: ver <span>3.3.10-1</span> (installed using apt install <span>libfftw3-dev</span>)</div><div style="font-family: Arial, sans-serif; font-size: 14px;">MPI: <span>ver 4.1.4-3+b1 (installed using apt install <span>libopenmpi-dev</span>)</span></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><span>libxc: ver <span>5.2.3-1</span> (installed using apt install libxc-dev)<br></span></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><span>hdf5: ver <span>1.10.8+repack1-1</span>(installed using apt install <span>libhdf5-dev</span>)</span></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><span>C compiler: gcc ver <span>4:12.2.0-3</span></span></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><span><span><br></span></span></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><span><span>Thanks a lot!</span></span></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><span><span><br></span></span></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><span><span>Best,</span></span></div><div style="font-family: Arial, sans-serif; font-size: 14px;"><span><span>John<br></span></span></div><div class="protonmail_signature_block" style="font-family: Arial, sans-serif; font-size: 14px;"><div class="protonmail_signature_block-user"><div><br></div><div><br></div>
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