[kumar 2011]

when i have compiled udf in fluent ,the followning problem has been observed on fluent window.

Deleted old libudf\ntx86\2d\libudf.dll
1 file(s) copied.
(system "copy C:\Fluent.Inc\fluent6.3.26\src\makefile_nt.udf libudf\ntx86\2d\makefile")
1 file(s) copied.
(chdir "libudf")()
(chdir "ntx86\2d")()
'nmake' is not recognized as an internal or external command,
operable program or batch file.
'nmake' is not recognized as an internal or external command,
operable program or batch file.
Done.
"c:/documents and settings/administrator/desktop/fluent/fluent 6.3tutorial/introduction"
Opening library "libudf"...
Error: open_udf_library: The system cannot find the file specified.
Error Object: ()

The reason of the problem is not clear .pls help me