reported https://sourceforge.net/p/pidgin-hotkeys/patches/8/
bool is a keyword since c23, use boolean instead
--- a/src/hotkeys.c
+++ b/src/hotkeys.c
@@ -216,21 +216,21 @@ free_keys(GtkWidget* widget)
 static void
 hotkey_set_bool(GtkWidget *widget, HotkeyEntry* key)
 {
-    gboolean bool;
+    gboolean boolean;
     GdkDisplay* display;
     GdkWindow* root;
 
-    bool = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
-    purple_prefs_set_bool(key->use_pref, bool);
+    boolean = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
+    purple_prefs_set_bool(key->use_pref, boolean);
     
-    key->enable = bool;
+    key->enable = boolean;
 
     if (key->code)
     {
         display = widget ? gtk_widget_get_display(widget) : gdk_display_get_default();
         root = widget ? gtk_widget_get_root_window(widget) : gdk_get_default_root_window();
 
-        if (bool && grab_key(display, root, key))
+        if (boolean && grab_key(display, root, key))
 	    reconfig_blist(key - hotkeys);
         else
 	{