Strange Error in

HEllo, i’m starting programminig in Linux whit Open Gl at university.
I have a big problem: I work under KDevelop, and when i “Make” my project, the Gcc, return to me this error…

usr/X11R6/lib/ undefined reference to sqrt' /usr/X11R6/lib/ undefined reference to ceil’
/usr/X11R6/lib/ undefined reference to `floor’

I don’t know what it is… can you help me please??? Thanks Again
MAtteo -Italy-

Try add -lm.
( -lGL -lGLU -lm )

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