1 files changed, 3 insertions, 0 deletions
diff --git a/io.c b/io.c
index f3b40e8363..6059a974ee 100644
--- a/io.c
+++ b/io.c
@@ -127,6 +127,9 @@ static VALUE lineno = INT2FIX(0);
 #    define READ_DATA_PENDING_COUNT(fp) ((fp)->_egptr - (fp)->_gptr)
 #    define READ_DATA_PENDING_PTR(fp) ((fp)->_gptr)
 #  endif
+#elif defined(HAVE___FPENDING)
+#  define READ_DATA_PENDING(fp) (__fpending(fp) > 0)
+#  define READ_DATA_PENDING_COUNT(fp) (__fpending(fp))
 #elif defined(FILE_COUNT)
 #  define READ_DATA_PENDING(fp) ((fp)->FILE_COUNT > 0)
 #  define READ_DATA_PENDING_COUNT(fp) ((fp)->FILE_COUNT)