diff --git a/gnu/lib/libdialog/dlg_config.h b/gnu/lib/libdialog/dlg_config.h
index 1bd45183f50..30df29f877c 100644
--- a/gnu/lib/libdialog/dlg_config.h
+++ b/gnu/lib/libdialog/dlg_config.h
@@ -9,12 +9,20 @@
 #define CURSES_WACS_SYMBOLS 1
 #define DIALOG_PATCHDATE 20210117
 #define DIALOG_VERSION "1.3"
+#ifndef GCC_NORETURN
 #define GCC_NORETURN __attribute__((noreturn))
+#endif
 #define GCC_PRINTF 1
+#ifndef GCC_PRINTFLIKE
 #define GCC_PRINTFLIKE(fmt,var) __attribute__((format(printf,fmt,var)))
+#endif
 #define GCC_SCANF 1
+#ifndef GCC_SCANFLIKE
 #define GCC_SCANFLIKE(fmt,var) __attribute__((format(scanf,fmt,var)))
+#endif
+#ifndef GCC_UNUSED
 #define GCC_UNUSED __attribute__((unused))
+#endif
 #define HAVE_ALLOCA 1
 #define HAVE_BTOWC 1
 #define HAVE_COLOR 1