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+Avogadro Libraries is a subproject of Avogadro 2 as implementation of
+Avogadro 1.x mantained by OpenChemistry. It provides 3D rendering,
+visualization, analysis and data processing useful in computational
+chemistry, molecular modeling, bioinformatics, materials science, and
+related areas.
+Avogadro Libraries is a dependency required by the graphic interface
+user Avogadro Application (avogadroapp).
+
+This slackbuild requires as needed some dependencies (autodetected)
+that improve Avogadro Libraries. You can enable or disable them by
+passing variables to the script
+(e.g. VAR=yes|no ./avogadrolibs.SlackBuild):
+
+LIBMSYM=yes|no (default: yes, libmsym required)
+SPGLIB=yes|no (default: yes, spglib required)
+MMTF=yes|no (default: yes, mmtf-cpp required)
+HDF5=yes|no (default: no, hdf5 required)
+VTK=yes|no (default: no, VTK required)
+
+The extension Avogadro Generators (disabled by default) installs
+Python input generators that can be run by the Avogadro 2 application
+(avogadroapp) to generate input for various codes (Dalton, Q-Chem,
+Orca, NWChem, ecc.): these scripts will be installed in a location
+where the Avogadro 2 application can find them if the Plugin
+Downloader is executed from the graphic interface user.
+To enable the extension the dependency pybind11 is required and you
+have to pass the variable PYTHON=yes to the slackbuild script:
+
+PYTHON=yes ./avogadrolibs.SlackBuild
+
+WARNING: the build enabling the support of VTK libraries works only
+with VTK < 9.0 or VTK >= 9.2.6. The build against VTK 9.0.x fails.
+Other versions of VTK 9.x earlier than 9.2.6 are not tested.
+
+Since Avogadro 2 version 1.98.0, the build requires cmake at version
+3.24 or greater. This version is the latest compatible with Slackware
+15.0 that has cmake remained at the version 3.21.