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<H1><A ID="SECTION00040000000000000000">
3 Compilation</A>
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<P>
<TT>PWneb</TT> is a package tightly bound to Q<SMALL>UANTUM </SMALL>ESPRESSO.
For instruction on how to download and compile Q<SMALL>UANTUM </SMALL>ESPRESSO, please refer
to the general Users' Guide, available in file <TT>Doc/user_guide.pdf</TT>
under the main Q<SMALL>UANTUM </SMALL>ESPRESSO directory, or in web site
<TT>http://www.quantum-espresso.org</TT>.
<P>
Once Q<SMALL>UANTUM </SMALL>ESPRESSO is correctly configured, <TT>PWneb</TT> can be automatically
downloaded, unpacked and compiled by
just typing <TT>make neb</TT>, from the main Q<SMALL>UANTUM </SMALL>ESPRESSO directory.
<TT>make neb</TT> will produce
the following codes in <TT>NEB/src</TT>:
<UL>
<LI><TT>neb.x</TT>: calculates reaction barriers and pathways using NEB.
</LI>
<LI><TT>path_interpolation.x</TT>: generates a reaction path (a set of points
in the configuration space of the atomic system, called ``images''), by
interpolating the supplied path. The new path can have a
different number of images than the old one and the initial and final
images of the new path can differ from the original ones.
The utility <TT>path_interpolation.sh</TT> in the <TT>tools/</TT>
directory shows how to use the code.
</LI>
</UL>
<P>
Symlinks to executable programs will be placed in the
<TT>bin/</TT> subdirectory of the main Q<SMALL>UANTUM </SMALL>ESPRESSO directory.
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