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<H2><A ID="SECTION00032000000000000000"></A>
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2.2 Prerequisites
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<P>
To install Q<SMALL>UANTUM </SMALL>ESPRESSO from source, you need first of all a minimal Unix
environment, that is: a command shell (e.g., bash, sh) and utilities <TT>make</TT>,
<TT>awk</TT>, <TT>sed</TT>. For MS-Windows, see Sec.<A HREF="node15.html#SubSec:Windows">2.8.4</A>.
<P>
Note that the scripts contained
in the distribution assume that the local language is set to the
standard, i.e. "C"; other settings
may break them. Use <TT>export LC_ALL=C</TT> (sh/bash) or
<TT>setenv LC_ALL C</TT> (csh/tcsh) to prevent any problem
when running scripts (including installation scripts).
<P>
Second, you need C and Fortran compilers, compliant with C89 and
F2003 standards<A ID="tex2html1"
HREF="footnode.html#foot291"><SUP>1</SUP></A>. For parallel
execution, you will also need MPI libraries and a parallel
(i.e. MPI-aware) compiler. For massively parallel machines, or
for simple multicore parallelization, an OpenMP-aware compiler
and libraries are also required. For GPU's, you will need the
CUDA Fortran version and to compile with the PGI compiler and
run with CUDA run-time environment.
<P>
As a rule, Q<SMALL>UANTUM </SMALL>ESPRESSO tries to keep compatibility with older compilers,
avoiding nonstandard extensions and newer features that
are not widespread or stabilized. If however your compiler is very
old (say older than ∼5 years or so) it is quite likely that
something will not work. The same applies to mathematical
and MPI libraries.
<P>
Big machines with
specialized hardware (e.g. IBM SP, CRAY, etc) typically have a
Fortran compiler with MPI and OpenMP libraries bundled with
the software. Workstations or ``commodity'' machines, using PC
hardware, may or may not have the needed software. If not, you need
either to buy a commercial product (e.g Intel, NAG, PGI) or to
use an open-source compiler like gfortran from the gcc distribution.
Some commercial compilers (e.g. PGI) may be available free of charge
under some conditions (e.g. academic or personal usage).
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