1 files changed, 10 insertions, 0 deletions
diff --git a/src/math/y1.c b/src/math/y1.c
new file mode 100644
index 00000000..b4c84a10
--- /dev/null
+++ b/src/math/y1.c
@@ -0,0 +1,10 @@
+#include <math.h>
+
+double y1(double x)
+{
+        return x;
+}
+
+/*
+XOPEN(4)
+*/