udf compiling error concerning 'nmake'

Violet

Hi Guys, I am going through one of Fluent's tutorials and there is UDF that I need to compile. Every time that I try to compile the C program using Fluent (exactly as described in the tutorial), I got the error message that "'nmake' is not recognized as an internal or external command, operable program or batch file".

Since this is a udf written by Fluent people, it should be error-free so I wonder if there is something else that is wrong. Thanks a lot.