Because the Slackware community is not as big as the Ubuntu one, the Slackware tutorials are less that the Ubuntu ones. (Yes, this is a Captain Obvious afirmation)

So, in this article I will show you how to install the FluxBox Window Manager on Slackware 14.0, the last but not least Slackware stable Linux distro.
Fluxbox 1.3.2 is available on Slackware 14 from the default repositories. To install it, just type: slackpkg install fluxbox.
However, if you want the latest version of FluxBox, which is FluxBox 1.3.3 on your Slackware 14.0 Linux Operating System, follow this steps:
Follow these steps for a successfully installation:
Download the Fluxbox package from the following sourceforge link:
http://sourceforge.net/projects/fluxbox/files/fluxbox/1.3.3/fluxbox-1.3.3.tar.gz/download
Next, do this :
$ tar -zxvf fluxbox-*.tar.gz
$ cd fluxbox*
$ ./configure
$ make
$ su
# make install