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Including non-ansi functions from <math.h> in compiled UDFs
The Fluent makefile uses the 'ansi' flag which excludes certain library functions, e.g. the error function in <math.h>. You will get a compiler warning 'implicit declaration' if you try to use such a function. You will end up with a function returning int, regardless of the definition (i.e. in most cases total nonsense).
You can use these functions by declaring them explicitly in your source file:
This will lead to a useable error function (of course, it has to be defined in your library, which is platform dependent).