You aren't by any chance trying to install this into / via a dir with spaces in the file name are you?  This happened to me once and the gem was built properly and it claimed to install fine.  It was however depositing the native extensions part of the somewhere unexpected so it couldn't be loaded when using the gem.<div>
<br></div><div>Muz</div><div><div><br><div class="gmail_quote">On 17 January 2011 14:48, Adrian Stainforth <span dir="ltr"><<a href="mailto:adrian.stainforth@gmail.com">adrian.stainforth@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">hmm ok I ran it and got the following:<div><br></div><div><div>  205   ??  S      0:00.02 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/usr/local/mysql/data --pid-file=/usr/local/mysql/data/Emma-Reardons-MacBook-Pro.local.pid</div>


<div>  277   ??  S      0:01.33 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/usr/local/mysql/data/Emma-Reardons-MacBook-Pro.local.err --pid-file=/usr/local/mysql/data/Emma-Reardons-MacBook-Pro.local.pid</div>


<div> 4207 s000  R+     0:00.00 grep mysql</div><div><br></div><div><br></div><br><div class="gmail_quote"><div><div></div><div class="h5">On 17 January 2011 14:36, artem avetisyan <span dir="ltr"><<a href="mailto:artemave@gmail.com" target="_blank">artemave@gmail.com</a>></span> wrote:<br>


</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div></div><div class="h5"><div style="border-collapse:collapse;font-family:arial, sans-serif;font-size:10.8333px">
You are probably still running mysql 5.5 installed as a package from here <a href="http://dev.mysql.com/downloads/mysql/" target="_blank">http://dev.mysql.com/downloads/mysql/</a> </div>


<div style="border-collapse:collapse;font-family:arial, sans-serif;font-size:10.8333px">Despite the fact that you've installed 5.1 manually.</div><div style="border-collapse:collapse;font-family:arial, sans-serif;font-size:10.8333px">



You can find it out for instance by examining the output of `ps ax | grep mysql` in console.</div><div><div></div><div><div style="border-collapse:collapse;font-family:arial, sans-serif;font-size:10.8333px"><br>

</div><blockquote class="gmail_quote" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex">
<font face="arial, sans-serif"><span style="border-collapse:collapse;font-size:11px">Erm sorry that's a bit beyond me, can you elaborate a bit more? thanks :)</span></font></blockquote>
<blockquote class="gmail_quote" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex">
<br></blockquote><font face="arial, sans-serif" size="1"><blockquote>On 17 January 2011 14:03, artem avetisyan <<a href="mailto:artemave@gmail.com" target="_blank">artemave@gmail.com</a>> wrote:</blockquote>
</font><blockquote><br></blockquote><font face="arial, sans-serif" size="1"><blockquote>> Adrian,</blockquote></font><font face="arial, sans-serif" size="1"><blockquote>
></blockquote></font><font face="arial, sans-serif" size="1"><blockquote>> Check (with `ps ax`) which mysqld is running. I bet it is 5.5 which was</blockquote></font><font face="arial, sans-serif" size="1"><blockquote>



> installed as MacOS package. Not the 5.1 you installed manually. Fix that and</blockquote></font><font face="arial, sans-serif" size="1"><blockquote>> everything will just magically work.</blockquote>
</font><font face="arial, sans-serif" size="1"><blockquote>></blockquote></font><font face="arial, sans-serif" size="1"><blockquote>> Regards,</blockquote></font><font face="arial, sans-serif" size="1"><blockquote>



> Artem.</blockquote></font><font face="arial, sans-serif" size="1"><blockquote>></blockquote></font>
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<br></div></blockquote></div><div class="im"><br><br clear="all"><br>-- <br>Kind Regards<br>Adrian Stainforth<br><br>Front-end Developer<br>Mobile: +447740069109<br><br>
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