i am compiling a network simulator with gcc-compiler2.96 and that gives me a linker error as follows -------------------------------------------------------------------- ../mac/pmac1.o(.text+0x3e5): In function `COORD_CalcDistanceAndAngle': /home/nkhan/qualnet/3.6/main/../include/coordinates.h:301: undefined reference to `assert' collect2: ld returned 1 exit status make: *** [../bin/qualnet] Error 1 can you tell me any intuition how and what to look for since the function COORD_CalcDistanceAngle (mentioned in the error) has no errors in itself Nor there is a reference to it in pmac1.o as mentioned in the linker error. thanks -nabeel