Precompiler flags

[Jasen]

Hello all!
The instruction to the source code says me to set a precompiler flag ASSIMILATION in the projects settings, in order some lines to be skipped during compilation. I am not very familiar with precompiler flags. So I tried to write in "Other compiler options": -ASSIMILATION, but it didn't help. Here is the code from the main.f90.

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#ifdef _ASSIMILATION
      !use the Data Assimilation modules (pre-compiler flag ASSIMILATION to be set in Visual Studio project settings or in the makefile)
      USE ASSIMILATION_INTERFACE
      USE ASSIMILATION_ROUTINES
      USE ASSIMILATION_VARIABLES
#endif
Could somebody explain me, how to create these precompiler flags.
Now it's the only fatal error: Fatal Error: Can't open module file 'assimilation_interface.mod' for reading at (1): No such file or directory|

[BlueHazzard]

I don't know anything about fortran but if it is similar to the c preprocessor you have to add
-DASSIMILATION as other compiler option, or use the #defines tab of the compiler settings....