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<p>
Previous: <a href="Library-Combination.html#Library-Combination" accesskey="p" rel="prev">Library Combination</a>, Up: <a href="Common-Variables.html#Common-Variables" accesskey="u" rel="up">Common Variables</a> </p>
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<a name="Overridable-Flags-1"></a>
<h4 class="subsection">1.7.5 Overridable Flags</h4>
<dl>
<dt><a name="index-OBJCFLAGS-1"></a>Variable: <strong>OBJCFLAGS</strong></dt>
<dd><p><code>OBJCFLAGS</code> are flags that are passed to the compiler when
compiling Objective-C files. The user can override this variable when
running make and specify different flags as the following command
illustrates:
</p></dd></dl>
<div class="smallexample">
<pre class="smallexample">make OBJCFLAGS="-Wno-implicit -Wno-protocol"
</pre></div>
<dl>
<dt><a name="index-CFLAGS-1"></a>Variable: <strong>CFLAGS</strong></dt>
<dd><p><code>CFLAGS</code> are flags that are passed to the compiler when compiling
C files. The user can override this variable when running make and
specify different flags as the following command illustrates:
</p></dd></dl>
<div class="smallexample">
<pre class="smallexample">make CFLAGS="-Wall"
</pre></div>
<dl>
<dt><a name="index-OPTFLAG"></a>Variable: <strong>OPTFLAG</strong></dt>
<dd><p><code>OPTFLAG</code> is the flag used to indicate the optimization level
that the compiler should perform when compiling Objective-C and C
files; this flag is set to ‘<samp>-O2</samp>’ by default, but the user can
override this setting when running make as the following command
illustrates:
</p></dd></dl>
<div class="smallexample">
<pre class="smallexample">make OPTFLAG=
</pre></div>
<p>This command sets the optimization flag to be empty so that no
optimization will be performed by the compiler.
</p>
<dl>
<dt><a name="index-GNUSTEP_005fINSTALLATION_005fDOMAIN-2"></a>Variable: <strong>GNUSTEP_INSTALLATION_DOMAIN</strong></dt>
<dd><p><code>GNUSTEP_INSTALLATION_DOMAIN</code> is the domain where the package
will install its files; overriding this variable when running make
will change all of the variables within the Makefile Package that
depend upon it; the following command illustrates the use of this
variable:
</p></dd></dl>
<div class="smallexample">
<pre class="smallexample">make GNUSTEP_INSTALLATION_DOMAIN=SYSTEM
</pre></div>
<p>This command states that the <code>SYSTEM</code> domain should be used as
the installation root directory; in particualr applications in the
package will be installed in the <samp>$GNUSTEP_SYSTEM_APPS</samp>
directory, libraries in the package will be installed under the
<samp>$GNUSTEP_SYSTEM_LIBRARIES</samp> directory, command line tools will be
installed under the <samp>$GNUSTEP_SYSTEM_TOOLS</samp> directory, etc.
Depending on the filesystem layout, the various directories may be
located anywhere, which is why it’s important to also refer to them by
using variables such as <code>GNUSTEP_APPS</code>, <code>GNUSTEP_LIBRARIES</code>
and <code>GNUSTEP_TOOLS</code>, which automatically point to the right
directory on disk for this filesystem layout and installation domain.
</p>
<p>By default the Makefile Package sets
<code>GNUSTEP_INSTALLATION_DOMAIN</code> to <code>LOCAL</code>.
</p>
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