wxGTK is part of wxWidgets, a cross-platform API for writing GUI applications on multiple platforms that still utilize the native platform's controls and utilities. This is a unicode shared build. If you do not want the unicode build, use: UNICODE=NO ./wxGTK.SlackBuild If you want support for gnomeprint pass GNOMEPRINT=yes to the script. This will require libgnomeprint and libgnomeprintui, both available from SlackBuilds.org. This package conflicts with wxPython because wxGTK is already included there. Both cannot be installed at the same time!