Thanks JMV for a really helpfull response. 

I've copied over the required files from the built jpeg-6b sources and
the only thing missing is Error.h. Under JPEGReadWriterPlugin2 >>
translation >> header file (on the class side), I find

headerFile
^
'/*#include <stdio.h>*/
/* Interface to JPEG code */
#include "jpeglib.h"
#include <setjmp.h>

struct error_mgr2 {
  struct jpeg_error_mgr pub;	/* "public" fields */

  jmp_buf setjmp_buffer;	/* for return to caller */
};

typedef struct error_mgr2* error_ptr2;

void error_exit (j_common_ptr cinfo);
'

Is this Error.h?

Cheers

John
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