Cruft removal

diff --git a/src/math/interaction.c b/src/math/interaction.c
index f2831d27680d26033965a756c0aebf5c808fd177..7fc9f0f63d2c5efee0098f06fe921d50758425e6 100644 (file)
--- a/src/math/interaction.c
+++ b/src/math/interaction.c
@@ -15,7 +15,7 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
 /*
-  An interaction is a gsl_vector containing a "product" of other
+  An interaction is a structure containing a "product" of other
   variables. The variables can be either categorical or numeric.
   If the variables are all numeric, the interaction is just the
   scalar product. If any of the variables are categorical, their
@@ -31,10 +31,9 @@
 
 #include <config.h>
 #include <assert.h>
-#include <gsl/gsl_math.h>
-#include <gsl/gsl_vector.h>
 #include <data/value.h>
 #include <data/variable.h>
+#include <gl/unistr.h>
 #include <math/interaction.h>
 #include <string.h>
 #include <xalloc.h>