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In article <1993May13.135200.13948@ennews.eas.asu.edu>, mfindler@enuxha.eas.asu.edu (Michael J. Findler) writes:
>         undefined symbol MyScreen(char *, int) referenced from text segment

The fact that it is reporting the argument types indicates that it is
looking for the C++ mangled name, not the C regular name.

>         The prototype looks like:
> 
>                 void MyScreen( char *picfile, int index = 0 ); // in type.h

If this is to be included by a C++ source file, you need this around it:

	#ifdef __cplusplus
	extern "C" {
	#endif

	void MyScreen( char *picfile, int index = 0 );

	#ifdef __cplusplus
	}
	#endif

>         And the function Definition looks like:
> 
>                 void MyScreen( char *picfile, int index )  // in shade.c

Since you are defining it in a C module, you need to inform the C++
sources of that so they can generate the correct symbol name (C
instead of C++).

DJ