Added missing #include

diff --git a/src/math/interaction.c b/src/math/interaction.c
index be3d3edb576bad70a4b15d9c6a8a8b27fde5d0a6..a8449a0b5bd6b659638101fda5edd75225967b80 100644 (file)
--- a/src/math/interaction.c
+++ b/src/math/interaction.c
@@ -35,6 +35,7 @@
 #include <gsl/gsl_vector.h>
 #include <data/category.h>
 #include <data/variable.h>
+#include "interaction.h"
 
 /*
   Convert a list of values to a binary vector. The order of VALS must