diff --git a/src/gui/Window.cc b/src/gui/Window.cc
index 52235bd..0a6a548 100644
--- a/src/gui/Window.cc
+++ b/src/gui/Window.cc
@@ -53,12 +53,22 @@ static bool Initialize_OpenGL()
 {
     if (gl3wInit() != 0)
     {
+        std::cerr << "Failed to initialize gl3w." << std::endl;
+
         /* Failed to gl3wInit() */
         return false;
     }
 
     if (!gl3wIsSupported(3, 0))
     {
+        std::cerr << "Error: OpenGL 3.0 is required." << std::endl;
+
+        std::cerr << "OpenGL version: "
+            << glGetString(GL_VERSION)
+            << ", GLSL: "
+            << glGetString(GL_SHADING_LANGUAGE_VERSION)
+            << std::endl;
+
         /* OpenGL 3.0 is not supported */
         return false;
     }