i386 compat

[Hermit]

I'm new to FreeBSD.   5.2.1 amd64 is 
listed as 'supported' for a commerical 
package I need to run.  I try to install 
mysql40-server, and other things for 
that matter, and the system complains 
that the package is for i386 machines. 
How do I get around this?  I've spent 
hours and finally found this in the 
archives:

You need to run 
/usr/src/tools/lib32/build32.sh with cwd 
set to /usr/src
to build the 32-bit loader & basic 
libraries.

Is this my answer?  What is 'cwd set to 
/usr/src mean?

Thanks.

Ken