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You need the OpenGL library. For more information about OpenGL,
check out http://www.opengl.org/.
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You also need the FreeType library. The official site of FreeType
is: http://www.freetype.org/.
GLTT requires version FreeType version 1.3.1. GLTT does not work
with FreeType2; if you are interested in FreeType2, see
FTGL.
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