3 files changed, 20 insertions, 0 deletions
diff --git a/src/mtx_qhull/list.h b/src/mtx_qhull/list.h
index ca76cb7..dfccede 100644
--- a/src/mtx_qhull/list.h
+++ b/src/mtx_qhull/list.h
@@ -1,6 +1,8 @@
 #ifndef QHULL_LIST_H
 #define QHULL_LIST_H
 
+#include <sys/types.h>
+
 typedef long int entry_t;
 typedef long int index_t;
 
diff --git a/src/mtx_qhull/vectors.h b/src/mtx_qhull/vectors.h
index 201205a..fadb370 100644
--- a/src/mtx_qhull/vectors.h
+++ b/src/mtx_qhull/vectors.h
@@ -1,3 +1,9 @@
+#ifndef QHULL_VECTORS_H
+#define QHULL_VECTORS_H
+
+#include <sys/types.h>
+#include "list.h"
+
 typedef struct vec_ {
     float c[3];
 } vector_t;
@@ -38,3 +44,5 @@ plane_t planeFromListedPoints(points_t points, list_t list);
 
 void printPlane(plane_t p);
 void printVector(vector_t v);
+
+#endif /* QHULL_VECTORS_H */
diff --git a/src/mtx_qhull/zhull.h b/src/mtx_qhull/zhull.h
index dd520e1..2a20768 100644
--- a/src/mtx_qhull/zhull.h
+++ b/src/mtx_qhull/zhull.h
@@ -1,3 +1,9 @@
+#ifndef QHULL_ZHULL_H
+#define QHULL_ZHULL_H
+
+#include <sys/types.h>
+#include "list.h"
+#include "vectors.h"
 
 typedef struct facet_ {
     plane_t plane;
@@ -23,3 +29,7 @@ zhull_t zhullInitPoints(const float *x, const float *y,
         const float *z, const size_t num_points);
 void printFacet(const zhull_t * const zh, 
       const facet_t * const f);
+
+facet_t *getFacetByIndex(const list_t facets, const index_t index);
+
+#endif /* QHULL_ZHULL_H */