GTK4: start building similar thing through scratchpad

scratchpad/makefile

@@ -0,0 +1,2 @@
+build:
+	gcc  -std=c99  -Wall   `pkg-config --cflags gtk4` test.c -o rosenrot `pkg-config --libs gtk4` 

scratchpad/test.c

@@ -0,0 +1,42 @@
+#include <gtk/gtk.h>
+
+#define WIDTH 1920 // 960 for half-width, 1920 for full width
+// #define HEIGHT 1080
+#define HEIGHT 1080
+
+static GtkNotebook* notebook;
+
+int
+main (int argc, char **argv)
+{
+ GtkWidget *window;
+  // Initialize i18n support with bindtextdomain(), etc.
+
+  // ...
+
+  // Initialize the widget set
+  gtk_init ();
+
+  // Create the main window
+  window = gtk_window_new ();
+  gtk_window_set_default_size(GTK_WINDOW(window), WIDTH, HEIGHT);
+
+  // Set up our GUI elements
+
+  notebook = GTK_NOTEBOOK(gtk_notebook_new());
+  gtk_notebook_set_show_tabs(notebook, false);
+  gtk_notebook_set_show_border(notebook, false);
+
+  // ...
+
+  // Show the application window
+  gtk_window_present (GTK_WINDOW (window));
+  gtk_window_set_child(GTK_WINDOW(window), GTK_WIDGET(notebook));
+
+  // Enter the main event loop, and wait for user interaction
+  while (!0)
+    g_main_context_iteration (NULL, TRUE);
+
+  // The user lost interest
+  return 0;
+}