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<title>Mac OS X</title>
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<h2 class="title" style="clear: both"><a id="build_unix_macosx"></a>Mac OS X</h2>
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<ol type="1">
<li>
<span class="bold">
<strong>When trying to link multiple
Berkeley DB language interfaces (for example, Tcl,
C++, Java, Python) into a single process, I get
"multiple definitions" errors from dyld.</strong>
</span>
<p>
To fix this problem, set the environment variable
MACOSX_DEPLOYMENT_TARGET to 10.3 (or your current
version of OS X), and reconfigure and rebuild Berkeley
DB from scratch. See the OS X ld(1) and dyld(1) man
pages for information about how OS X handles symbol
namespaces, as well as undefined and multiply-defined
symbols.
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<li>
<span class="bold">
<strong>When trying to use system-backed
shared memory on OS X I see failures about "too many
open files".</strong>
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<p>
The default number of shared memory segments on OS
X is too low. To fix this problem, create a file named
<code class="literal">/etc/sysctl.conf</code>, containing the
variable assignments:
</p>
<pre class="programlisting">kern.sysv.shmmax=134217728
kern.sysv.shmmin=1
kern.sysv.shmmni=32
kern.sysv.shmseg=32
kern.sysv.shmall=1024</pre>
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and then reboot the system.
</p>
<p>
Check the version of OS X carefully because some
versions require all five parameters to be set.
</p>
<p>
The <code class="literal">SHMMAX</code> variable should be set to a value
that is an exact multiple of 4096. Some versions of
OS X ignore the value if it is not an exact multiple.
</p>
<p>
Please check and verify with the OS X documentation
on the proper setting of these parameters. In some
cases a reboot is necessary and in others it is possible
to change them dynamically using <code class="literal">sysctl</code>.
</p>
<p>
The <code class="literal">/etc/sysctl.conf</code> file exists in OS X
10.3.9 and later. If you are running a version of OS X
previous to 10.3.x, edit the <code class="literal">/etc/rc</code>
file and change the values in the following commands:
</p>
<pre class="programlisting">sysctl -w kern.sysv.shmmax=134217728
sysctl -w kern.sysv.shmseg=32</pre>
<p>
and then reboot the system.
</p>
<p>
OS X system updates will overwrite <code class="literal">/etc/rc</code>
so any changes to the file must be redone after sytem updates.
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