--- io.c-	2019-02-20 08:10:20.917416172 +0900
+++ io.c	2019-02-20 08:10:33.953347904 +0900
@@ -1033,8 +1033,8 @@
 
 struct timeval *time_timeval();
 
-#ifdef _STDIO_USES_IOSTREAM  /* GNU libc */
-#  ifdef _IO_fpos_t
+#if 1  /* GNU libc */
+#  if 1
 #    define READ_DATA_PENDING(fp) ((fp)->_IO_read_ptr < (fp)->_IO_read_end)
 #  else
 #    define READ_DATA_PENDING(fp) ((fp)->_gptr < (fp)->_egptr)