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-rw-r--r--vm_debug.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/vm_debug.h b/vm_debug.h
index 230f0f7b16..fa70de334d 100644
--- a/vm_debug.h
+++ b/vm_debug.h
@@ -31,6 +31,10 @@ void ruby_set_debug_option(const char *str);
RUBY_SYMBOL_EXPORT_END
+#ifndef RUBY_DEVEL
+# define RUBY_DEVEL 0
+#endif
+
#if RUBY_DEVEL
#ifndef USE_RUBY_DEBUG_LOG
#define USE_RUBY_DEBUG_LOG 0