compiled newlib, need to hook up the system calls

sysroot/usr/include/unistd.h

@@ -0,0 +1,28 @@
+#ifndef _UNISTD_H
+#define _UNISTD_H
+
+#include <sys/types.h>
+
+/* Standard file descriptors used by streams */
+#define STDIN_FILENO  0   /* Standard input */
+#define STDOUT_FILENO 1   /* Standard output */
+#define STDERR_FILENO 2   /* Standard error output */
+
+/* Seek constants for lseek() / _PDCLIB_lseek() */
+#ifndef SEEK_SET
+#define SEEK_SET        0   /* Seek from beginning of file */
+#define SEEK_CUR        1   /* Seek from current position */
+#define SEEK_END        2   /* Seek from end of file */
+#endif
+
+/* Null pointer declaration constant */
+#ifndef NULL
+#define NULL ((void *)0)
+#endif
+
+int open(const char *pathname, int flags, ...);
+int read(int fd, void *buf, size_t count);
+int close(int fd);
+
+
+#endif /* _UNISTD_H */