--- a/extern/curve_fit_nd/intern/curve_fit_cubic.c
+++ b/extern/curve_fit_nd/intern/curve_fit_cubic.c
@@ -42,6 +42,7 @@
 
 #include <string.h>
 #include <stdlib.h>
+#include <alloca.h>
 
 #include "../curve_fit_nd.h"