#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
-#include <unistd.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
#include <string.h>
-#include <assert.h>
#include <ctype.h>
-#include <signal.h>
#define NONAMELESSUNION
#define NONAMELESSSTRUCT