This is probably the section you need to re-read.
Compiling 32-bit programs
In case you need to compile a 32-bit program (wine and grub are two examples
of open source programs that are 32-bit only) you first configure your
shell environment by running the command:
Note the 'dot' in front of the filename - that is actually part of the
commandline! It will change or create several environment variables so
that 32-bit versions of binaries are preferred.
You will be able to use standard SlackBuilds to build 32-bit packages for
Slackware64. There are two things to keep in mind:
(1) You will have to define the ARCH variable as 'x86_64' even though you
are compiling a 32-bit program!
(2) You will have to edit the SlackBuild and if it wants to use 'lib64/'
directories for "$ARCH = x86_64", you will have to force it to use 'lib/'
directories instead. Usually, this is accomplished by finding a definition
and change this line to
Alternately you could use sbopkg to manage your 3rd party applications it is available here. http://www.sbopkg.org/
I they don't have a package you could learn to write a slackbuild http://www.slackwiki.org/Writing_A_SlackBuild_Script
or use something that will do the job for you, such as http://www.src2pkg.net/
Hope this helps.