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+Table of contents
+
+1. BUILD-TIME DEPENDENCIES
+2. PYTHON BINDINGS AND DEPENDENCIES
+3. RUNTIME DEPENDENCIES AND FORMATS
+4. ISSUES
+
+1. BUILD-TIME DEPENDENCIES
+Regardless of settings in this slackbuild, a basic installation of QGIS
+requires these compile-time dependencies:
+ - proj
+ - geos
+ - libspatialite
+ - libspatialindex
+ - gdal
+ - qwt
+The slackbuilds of these are available in this repository. The packages
+gdal, proj, and geos are not reported in REQUIRES field of qgis.info
+because should be installed as dependencies of others.
+Other dependencies must be already installed in your system with a
+full installation of Slackware (for example, Qt5, QScintilla, qca, 
+Python 3, qtkeychain, eccetera).
+
+Optional dependencies that are enabled as strictly required in this
+slackbuild are the following: 
+ - postgis: needed for PostGIS
+ 
+Other optional dependencies are enabled by default if found in the
+system. These are the following
+ - gpsbabel: for the GPS plugin
+ - grass: for the Grass plugin
+ - pdal: for support to PDAL
+ - libdraco: for support to Draco plugin
+ - gsl: for georeferencing support
+ - fcgi: for the QGIS server functionality
+
+The build install as optional dependencies - autodetected - also
+hdf5 and netcdf. If they are installed, the support of PDAL and/or
+Draco can be disabled also by setting to "no" the environment variable
+   PDAL=no [DRACO=no] ./qgis.SlackBuild
+ 
+2. PYTHON BINDINGS AND DEPENDENCIES
+The functionality of QGIS is strongly enhanced by a lot of plugins that
+can be installed in runtime. Since these plugins are based on Python
+modules, the support of Python is enabled by default. This requires
+some Python dependencies that are available in a full installation of
+Slackware or as slackbuilds in this repository. For a full support of
+Python in QGIS you have to install the following packages (as reported
+in REQUIRES field of qgis.info):
+ - OWSLib
+ - python3-numpy
+ - python3-psycopg2
+ - termcolor
+Other python modules are required as nested dependencies. The lack of
+some of these modules could not affect the build/runtime of QGIS but
+could affect the part or the entire functionality of the Python
+support.
+
+3. RUNTIME DEPENDENCIES AND FORMATS
+Optional run-time dependencies are:
+ - OTB
+ - R
+ - saga-gis
+ - TauDEM
+
+QGIS supports indirectly several formats that depends on the GDAL
+support in build-time (usually autodetected). For example, the support
+of the proprietary format ECW is enabled in QGIS if gdal has been build
+with this support (this requires the package libecwj2 installed before
+build gdal).
+
+4. ISSUES
+Support to OpenCL is enabled by default but the build could fail in
+systems with old drivers/graphic cards. If you want to prevent this
+pass to the slackbuild the environment variable
+
+   OPENCL=no ./qgis.SlackBuild
+
+It has reported that QGIS shows runtime warnings about 'osgeo' unless
+the Python GDAL library is installed. If you encounter this issue you
+can solve by installing via pip the Python GDAL library as simple user
+(not root!) as following
+   $ pip install GDAL
+
+Other issues not noticed may be encountered depending on various
+system settings. If you found any problem please contact the
+maintainer.