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<font color="red"><b>This page is for Linux only!! But not necessary</b></font>
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- <font color="#800000"><b>Ghostscript</b></font>
When using the function <code>bitmap()</code> in Linux, the R
system requires Ghostscript software
to translate figure from ps file to other type image file, include jpeg, png and bmp etc.
To download, install and get more information, see
<a href="http://www.cs.wisc.edu/~ghost/" target="_blank">GNU Ghostscript</a> or
<a href="http://www.cups.org/ghostscript.php" target="_blank">ESP Ghostscript</a>.
- <font color="#800000"><b>In Renviron file</b></font>
Under <code>${R_HOME}/etc/Renviron</code>,
add an R system environment variable for ghostscript.
If the default <code>gs</code> is at <code>/usr/bin/gs</code>,
that Renviron will be
```
R_GSCMD=${R_GSCMD-'/usr/bin/gs'}
```
- <font color="#800000"><b>In Script</b></font>
If no permission to modify Renviron file, you can use the
R command <code>Sys.putenv()</code>
to setup the environment variable.
If the default <code>gs</code> is at <code>/usr/bin/gs</code>,
that environment variable can be setted by
```
Sys.putenv("R_GSCMD"="/usr/bin/gs")
```
See also <code>Sys.getenv()</code>.
- <font color="#800000"><b>In MS-Windows</b></font>
Use <code>gswin32c.exe</code> to instead of <code>gs</code> in Unix.
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