system.h

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#ifdef MSDOS
#include <io.h>
#endif

#if defined(HAVE_STDLIB_H) || defined(MSDOS)
#include <stdlib.h>
#endif

#if (defined(VMS) || defined(MSDOS)) && !defined(HAVE_STRING_H)
#define HAVE_STRING_H 1
#endif

#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
#include <string.h>
/* An ANSI string.h and pre-ANSI memory.h might conflict.  */
#if !defined(STDC_HEADERS) && defined(HAVE_MEMORY_H)
#include <memory.h>
#endif /* not STDC_HEADERS and HAVE_MEMORY_H */
#ifndef bcopy
#define bcopy(src, dst, num) memcpy((dst), (src), (num))
#endif
#else /* not STDC_HEADERS and not HAVE_STRING_H */
#include <strings.h>
/* memory.h and strings.h conflict on some systems.  */
#endif /* not STDC_HEADERS and not HAVE_STRING_H */