This website contains the SPTK class library related materials. This library is using FLTK 1.x/2.x library for GUI classes. If you need UTF8 support in your FLTK 1.x application, then you can use FLTK 1.3. FLTK 2.x supports unicode for any 2.x version.
SPTK uses GPL/LGPL License Agreement that can be found here.
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