can't bring up wiget gallery in manjaro x86_64 latest version

[faywong]

./examples/widget_gallery/widget_gallery 
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
X Error of failed request:  GLXBadContext
  Major opcode of failed request:  154 (GLX)
  Minor opcode of failed request:  6 (X_GLXIsDirect)
  Serial number of failed request:  36
  Current serial number in output stream:  35

[rubenvb]

This seems to indicate you have no functional OpenGL driver (or SkUI is doing things wrong or in a way incompatible with your driver stack).
What's your glxinfo output?