build: Add missing variable definition

diff --git a/gtk/meson.build b/gtk/meson.build
index 90d7b277a9c495e38972092b6a5428cf1d57ea06..fe0ec456d9db3af10f7980017977371f630a80ee 100644 (file)
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -778,6 +778,7 @@ if os_unix
 endif
 
 if os_win32
+  gtk_win32_print_headers = []
   gtk_win32_print_sources = files([
     'gtkprint-win32.c',
     'gtkprintoperation-win32.c',