>> No, it forces certain linker flags in the generated
>> Makefiles.  If the
>> flag allows the package to compile, keep it.
>
> Seems to be working! I'm building kdebase now. Might take 3-4 hours or so,
> but seems to be chugging hard.
>
> Building is much slower in a virtual machine. :( I think I might copy my
> setup to a spare drive (minus the KDE packages) so I can reboot at night
> to build packages faster. Or learn to setup a chroot environment. I don't
> have a fast second machine for this kind of project. Any suggestions?
>
I would go with chroot myself (and do so on the QuickBuild system). 
Without further information about Slackware I can't help out much more on
this topic; I know Debian provides a tool that can create a minimal chroot
image given only the release codename and URL to package repository. 
Perhaps Slackware has something similar?

Once you have the chroot, it is very simple to use:
chroot /path/to/chroot/root/directory

Then do whatever compilations, etc. inside that shell.  When done, a
simple "exit" command will return you to the host system.

Tim