Robert Cahn writes:
All was well until I needed to use the pow function. I used #include <math.h> as in the past but when I link I get calculate.o(.text+0x14bf): In function `cgiMain': calculate.c: undefined reference to `pow' when I look at math.h there is no reference to pow.
math.h includes bits/mathcall.h, which defines pow(). Add the -lm flag to your link command.
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