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void TTF_SetFontKerning(TTF_Font *font, int allowed)
Set whther to use kerning when rendering the loaded font. This has no effect on individual glyphs, but rather when rendering whole strings of characters, at least a word at a time. Perhaps the only time to disable this is when kerning is not working for a specific font, resulting in overlapping glyphs or abnormal spacing within words.
NOTE: Passing a NULL font into this function will cause a segfault.
see section Kerning,
Kerning @ Wikipedia