diff --git a/src/main.c b/src/main.c
index 977dab7..f411065 100755
--- a/src/main.c
+++ b/src/main.c
@@ -8,6 +8,7 @@
 #define CGLM_ALL_UNALIGNED
 #include <cglm/vec3.h>
 #include <cglm/vec4.h>
+#include <string.h>
 
 #define WIDTH 512
 #define HEIGHT 512
@@ -24,6 +25,7 @@ unsigned char palette[] =
 };
 
 void calc_normal(float* p1, float* p2, float* p3, float* normal, unsigned char n) {
+    float **u;
     float alpha;
     vec4 v1, v2, v3;
     vec4 u1, u2, u3;
@@ -36,7 +38,7 @@ void calc_normal(float* p1, float* p2, float* p3, float* normal, unsigned char n
         glm_vec3_cross(v1, v2, normal);
         glm_vec3_normalize(normal);
         return;
-
+#if 0
     case 4:
         glm_vec4_sub(p2, p1, v1);
         glm_vec4_sub(p3, p1, v2);
@@ -64,9 +66,9 @@ void calc_normal(float* p1, float* p2, float* p3, float* normal, unsigned char n
         glm_vec4_copy(u3, normal);
         glm_vec4_normalize(normal);
         return;
-
+#endif
     default:
-        float** u = malloc((n - 1) * sizeof(float*));
+        u = malloc((n - 1) * sizeof(float*));
         for (unsigned char i = 0; i < n - 1; i++) {
             u[i] = malloc(n * sizeof(float));
         }