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I can't seem to get rid of these seemingly random compiles errors in one of my classes. I get about 4 errors such as: multiple definition of `draw_line(float, float, float, float)' and multiple definition of `near_far_clip(float, float, float*, float*, float*, float*, float*, float*)' that are flagged in the middle of the method. I also consistently get multiple definition of `stack' in the middle of another method. stack is a global variable in a totally different file. It isn't even mentioned in the file I'm getting the error in. I tried separating the error prone file into .h and .cpp files (was originally just a .cpp) and nothing about the error changed... I don't have duplicate methods. I only have one #include of lines.h and there is an #ifndef clause at the beginning. All these errors appear in the .cpp file. Any ideas what it could be? Alright, I got the code up: lines.cpp ThreeD.cpp ThreeD.h makefile The lines.cpp is a converted .c file I received from my instructor. I included the makefile just in case, because I always have problems with it. I also annotated exactly where the errors were flagged in the file, but they seem pretty random so I don't know if it's particularly important. I abandoned the .h file because it wasn't solving anything or helping. I believe it will be easier to find the mistake without it. Here is the requested main.cpp file (there is no .h). I remade the lines.h fi

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