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-rw-r--r--ext/tk/tcltklib.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/ext/tk/tcltklib.c b/ext/tk/tcltklib.c
index 2d45f7511b..0798d0b24d 100644
--- a/ext/tk/tcltklib.c
+++ b/ext/tk/tcltklib.c
@@ -20,7 +20,11 @@
#endif
#undef RUBY_UNTYPED_DATA_WARNING
+#ifdef HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P
+#define RUBY_UNTYPED_DATA_WARNING 1
+#else
#define RUBY_UNTYPED_DATA_WARNING 0
+#endif
#ifdef HAVE_RB_THREAD_CHECK_TRAP_PENDING
static int rb_thread_critical; /* dummy */