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<BR>
2.1 Download
</H2>
<P>
Q<SMALL>UANTUM </SMALL>ESPRESSO is distributed in source form, but selected binary packages
and virtual machines are also available.
Stable and development releases of the Q<SMALL>UANTUM </SMALL>ESPRESSO source package
(current version is 6.7MaX), as well as available binary
packages, can be downloaded from the links listed in the
``Download'' section of <TT>www.quantum-espresso.org</TT>.
<P>
The Quantum Mobile virtual machine for Windows/Mac/Linux/Solaris
provides a complete Ubuntu Linux environment, containing Q<SMALL>UANTUM </SMALL>ESPRESSO and
more. Link and description in
<TT>https://www.materialscloud.org/work/quantum-mobile</TT>.
<P>
For source compilation, uncompress and unpack compressed archives
in the typical .tar.gz format using the command:
<PRE>
tar zxvf qe-X.Y.Z.tar.gz
</PRE>
(a hyphen before "zxvf" is optional) where <TT>X.Y.Z</TT> stands for the
version number. If your version of <TT>tar</TT>
doesn't recognize the "z" flag:
<PRE>
gunzip -c qe-X.Y.Z.tar.gz | tar xvf -
</PRE>
A directory <TT>qe-X.Y.Z/</TT> will be created.
<P>
A few additional packages that are not included in the base distribution
will be downloaded on demand at compile time, using <TT>make</TT>
(see Sec.<A HREF="node13.html#SubSec:Compilation">2.6</A>).
Note however that this will work only if the computer you are
installing on is directly connected to the internet and has
either <TT>wget</TT> or <TT>curl</TT> installed and working.
If you run into trouble, manually download each required package
into subdirectory <TT>archive/</TT>, <EM>not unpacking or
uncompressing it</EM>:
command <TT>make</TT> will take care of this during installation.
<P>
The Q<SMALL>UANTUM </SMALL>ESPRESSO distribution contains several directories. Some of them are
common to all packages:
<P>
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT"><TT>Modules/</TT></TD>
<TD ALIGN="LEFT">Fortran modules and utilities used by all programs</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>upflib/</TT></TD>
<TD ALIGN="LEFT">pseudopotential-related code, plus conversion tools</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>include/</TT></TD>
<TD ALIGN="LEFT">files *.h included by fortran and C source files</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>clib/</TT></TD>
<TD ALIGN="LEFT">libraries and utilities written in C</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>FFTXlib/</TT></TD>
<TD ALIGN="LEFT">FFT libraries</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>LAXlib/</TT></TD>
<TD ALIGN="LEFT">Linear Algebra (parallel) libraries</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>KS_Solvers/</TT></TD>
<TD ALIGN="LEFT">Iterative diagonalization routines</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>UtilXlib/</TT></TD>
<TD ALIGN="LEFT">Miscellaneous timing, error handling, MPI utilites</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>install/</TT></TD>
<TD ALIGN="LEFT">installation scripts and utilities</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>pseudo</TT>/</TD>
<TD ALIGN="LEFT">pseudopotential files used by examples</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>Doc/</TT></TD>
<TD ALIGN="LEFT">general documentation</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>archive/</TT></TD>
<TD ALIGN="LEFT">external libraries in .tar.gz form</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>test-suite/</TT></TD>
<TD ALIGN="LEFT">automated tests</TD>
</TR>
</TABLE>
<BR>
while others are specific to a single package:
<P>
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT"><TT>PW/</TT></TD>
<TD ALIGN="LEFT"><TT>PWscf</TT> package</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>EPW/</TT></TD>
<TD ALIGN="LEFT"><TT>EPW</TT> package</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>NEB/</TT></TD>
<TD ALIGN="LEFT"><TT>PWneb</TT> package</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>PP/</TT></TD>
<TD ALIGN="LEFT"><TT>PostProc</TT> package</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>PHonon/</TT></TD>
<TD ALIGN="LEFT"><TT>PHonon</TT> package</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>PWCOND/</TT></TD>
<TD ALIGN="LEFT"><TT>PWcond</TT> package</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>CPV/</TT></TD>
<TD ALIGN="LEFT"><TT>CP</TT> package</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>atomic/</TT></TD>
<TD ALIGN="LEFT"><TT>atomic</TT> package</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>GUI/</TT></TD>
<TD ALIGN="LEFT"><TT>PWGui</TT> package</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>HP/</TT></TD>
<TD ALIGN="LEFT"><TT>HP</TT> package</TD>
</TR>
</TABLE>
<P>
Finally, directory <TT>COUPLE/</TT> contains code and documentation
that is useful to call Q<SMALL>UANTUM </SMALL>ESPRESSO programs from external codes; directory
<TT>LR_Modules/</TT> contains source files for modules that are common
to all linear-response codes.
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