aux functions not working on opengl

[john_god]

If I remove

LIBS += c:/qt/2009.01/qt/lib/gl/glaux.lib

LIBS += c:/qt/2009.01/qt/lib/gl/glaux.lib

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from the .pro file I get the error:

D:/qt4examples/Matematica/glgraph.cpp:352: undefined reference to `auxSolidSphere@8'
:-1: error: collect2: ld returned 1 exit status

D:/qt4examples/Matematica/glgraph.cpp:352: undefined reference to `auxSolidSphere@8'
:-1: error: collect2: ld returned 1 exit status

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but if I leave the

LIBS += c:/qt/2009.01/qt/lib/gl/glaux.lib

LIBS += c:/qt/2009.01/qt/lib/gl/glaux.lib

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in the .pro file the errors are the ones I indicate in the post above

How can I know if I am liking?