1 files changed, 11 insertions, 0 deletions
diff --git a/missing/cbrt.c b/missing/cbrt.c
new file mode 100644
index 0000000000..1bcbc63392
--- /dev/null
+++ b/missing/cbrt.c
@@ -0,0 +1,11 @@
+#include "ruby/missing.h"
+#include <math.h>
+
+double cbrt(double x)
+{
+    if (x < 0)
+        return -pow(-x, 1/3.0);
+    else
+        return pow(x, 1/3.0);
+}
+