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<H2><A NAME="SECTION00031000000000000000">
2.1 Download</A>
</H2>

<P>
Presently, Q<SMALL>UANTUM </SMALL>ESPRESSO is distributed in source form; some precompiled 
executables (binary files) are provided for <TT>PWgui</TT>.
Packages for the Debian Linux distribution are however 
made available by <TT>debichem</TT> developers.
Stable releases of the Q<SMALL>UANTUM </SMALL>ESPRESSO source package (current version 
is 5.0.2) can be downloaded from the Download section
of <TT>www.quantum-espresso.org</TT>. If you plan to run
on GPU machines, download the GPU-enabled version, also reachable 
from the same link. 

<P>
Uncompress and unpack the base distribution using the command:
<PRE>
     tar zxvf espresso-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 espresso-X.Y.Z.tar.gz | tar xvf -
</PRE>
A directory <TT>espresso-X.Y.Z/</TT> will be created. Given the size 
of the complete distribution, you may need to download more packages.
If the computer you expect to install Q<SMALL>UANTUM </SMALL>ESPRESSO is always connected
to the internet, the <TT>Makefile</TT>'s will automatically download,
unpack and install the required packages on demand. If not,
you can download each required package into subdirectory
<TT>archive</TT> but <EM>not unpacked or uncompressed</EM>:
command <TT>make</TT> will take care of this during installation. 

<P>
Package <TT>GWL</TT> needs a manual download and installation:
please follow the instructions given at <TT>gww.qe-forge.org</TT>.

<P>
The bravest may access the development version via anonymous access to the
Subversion (SVN) repository: <TT>qe-forge.org/gf/project/q-e/scmsvn</TT>, 
link ''Access Info'' on the left. See also the Developer Manual
(<TT>Doc/developer_man.pdf</TT>), section ''Using SVN''.
Beware: the development version 
is, well, under development: use at your own risk! 

<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">source files for modules that are common to all programs</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">external libraries written in C</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT>flib/</TT></TD>
<TD ALIGN="LEFT">external libraries written in Fortran</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>upftools/</TT></TD>
<TD ALIGN="LEFT">converters to unified pseudopotential format (UPF)</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">contains plug-ins in .tar.gz form</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>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>
</TABLE>

<P>
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