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Fortran Program Calls C subroutine

Fortran Program Calls C subroutine

Fortran Program Calls C subroutine

(OP)
Hello, I am a C programmer, I have developed a set of subroutines in C and put them in a library, a .a file. These subroutines get called inside a Fortran program using CALL subroutine name.
I am working on IBM AIX. So the command I use to compile & link is -

xlf -o add.o -c liborac.a add.f
where liborac.a is the library with C subroutines

This gives me link errors saying my subroutines not found

The question is do I have some option missing to link these routines to the Fortran program. Or do I have to include the prototypes of the subroutines in the add.f program, like in C. Any help is appreciated. Thank you.  

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