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[FAQ]

The Fluent makefile uses the ‘ansi’ flag which excludes certain library functions, e.g. the error function in . 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 (in most cases total nonsense). You can use these functions by declaring them explicitly in your source file: double erf(double). This will lead to a useable error function (of course, it has to be defined in your library, which is platform dependent).