These packages are required and can be obtained from http://qgis.gotslack.org/
gdal-1.8.0-i486-1_jah.txz
proj-4.7.0-i486-1_jah.txz
geos-3.2.2-i486-1-jah.txz
libungif-4.1.4-i486-4.txz
qwt-5.1.1-i486-2_SBo.tgz
txt2tags-2.6-noarch-1.tgz
hdf5-1.8.3-i486-2mch.txz
netcdf-4.0-i486-1sl.tgz
These packages are also required and can be obtained from: http://www.slacky.eu
glibmm-2.18.2-i486-1as.txz
gsl-1.12-i486-1sl.tgz
gtkmm-2.14.5-i486-1as.txz
libgeotiff-1.2.5-i486-2sl.tgz
postgresql-8.4.4-i486-1sl.txz
unixodbc-2.2.14-i486-1gds.tgz
Some systems may require a downgrade to these Slackware 13.1 packages in order to support Python plugins:
sip-4.10.2-i486-1
PyQt-4.7.3-i486-1