1diff --git i/src/Implicit/impSurface.h w/src/Implicit/impSurface.h 2index 41fab81..027587f 100644 3--- i/src/Implicit/impSurface.h 4+++ w/src/Implicit/impSurface.h 5@@ -25,6 +25,7 @@ 6 #ifdef WIN32 7 #include <windows.h> 8 #endif 9+#include <cstddef> 10 #include <vector> 11 #include <GL/gl.h> 12