This HOWTO explains how to compile GRASS GIS on Slackware.

su - # switch to root
 
# create postgres group and user for postgresql, one of pdal dependencies
groupadd -g 209 postgres
useradd -u 209 -g 209 -d /var/lib/pgsql postgres
 
# install dependency libraries;
# build queuefiles, not packages, to automatically build any other dependencies
sbopkg -k -i "proj gdal pdal blas lapack"
 
# switch to non-root
exit
 
# download source code
mkdir -p ~/usr/local/src
cd ~/usr/local/src
git clone https://github.com/HuidaeCho/grass-build-scripts.git
git clone https://github.com/OSGeo/grass.git
git clone https://github.com/OSGeo/grass-addons.git
git clone https://github.com/OSGeo/gdal-grass.git