Enclose sleep replacement in HAVE_NANOSLEEP

macros/gr_pwin32.m4

@@ -31,7 +31,7 @@ AC_CHECK_HEADERS([winioctl.h winbase.h], [], [], [
 	#endif
 ])
 
-AC_CHECK_FUNCS([getopt getopt_long usleep sleep gettimeofday])
+AC_CHECK_FUNCS([getopt getopt_long usleep sleep nanosleep gettimeofday])
 AC_CHECK_TYPES([struct timezone, ssize_t],[],[],[
      #if HAVE_SYS_TYPES_H
      # include <sys/types.h>

src/sleep.c

@@ -35,6 +35,7 @@
  * \param same as man page for each
  *
  */
+#ifdef HAVE_NANOSLEEP
 #include <unistd.h>
 #include <errno.h>
 #include <time.h>
@@ -70,3 +71,4 @@ int usleep(useconds_t usec)
 
     return 0;
 }
+#endif // HAVE_NANOSLEEP