Thank you all very much for your response.
I'd like to answer your questions.
I have also added an attachement, which might provide some additional explanation.
The attachement contains five blocks:
Block1: Error messages when compiling and linking
Block2: Error messages when compiling and linking
Block3: The original Fortran source
Block4: The derived c-file
Block5: the header file
As you can see from looking at block1 and block2, there is no error message or warning from the compiler.
As block1 shows, there are calls to subroutines for handling complex numbers, that are not available from the standard libraries. By adding a link to libf77.lib and libi77.lib, these references are satisfied, however new ones are generated ( see block2 ).
I downloaded the Programs from
http://www.weihenstephan.de/~syring/f2c/f2c.html.
It seems that the files are identical to those provided by frankie, however I must admit, that I do not understand what he wants me to do.
Regards to all