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-rw-r--r--io/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/io/Makefile b/io/Makefile
index ce8708c7ba..8648235463 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -40,7 +40,7 @@ routines :=							      \
 	chdir fchdir						      \
 	getcwd getwd getdirname					      \
 	chown fchown						      \
-	ttyname isatty						      \
+	ttyname ttyname_r isatty				      \
 	link symlink readlink					      \
 	unlink rmdir						      \
 	ftw fts poll