// (leafs matching contents are considered empty, others are solid)
extern int cl_traceline_endcontents; // set by TraceLine
-float CL_TraceLine (vec3_t start, vec3_t end, vec3_t impact, vec3_t normal, int contents, int hitbmodels);
+float CL_TraceLine (const vec3_t start, const vec3_t end, vec3_t impact, vec3_t normal, int contents, int hitbmodels);
#endif