make the example build on macOS

example/main.cpp

@@ -28,8 +28,9 @@ int main() {
         return -1;
     }
     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
 
     // Create window
     GLFWwindow* window = glfwCreateWindow(800, 600, "Example", nullptr, nullptr);

implot3d.cpp

@@ -48,6 +48,7 @@
 #define IMGUI_DEFINE_MATH_OPERATORS
 #endif
 
+#include <cmath>
 #include "implot3d.h"
 #include "implot3d_internal.h"
 

implot3d_demo.cpp

@@ -291,7 +291,7 @@ void DemoSurfacePlots() {
             int idx = i * N + j;
             xs[idx] = range_min + j * step;                                   // X values are constant along rows
             ys[idx] = range_min + i * step;                                   // Y values are constant along columns
-            zs[idx] = sinf(std::sqrt(xs[idx] * xs[idx] + ys[idx] * ys[idx])); // Z = sin(sqrt(X^2 + Y^2))
+            zs[idx] = sinf(sqrt(xs[idx] * xs[idx] + ys[idx] * ys[idx])); // Z = sin(sqrt(X^2 + Y^2))
         }
     }