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-rw-r--r--internal/compilers.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal/compilers.h b/internal/compilers.h
index 68e2d33e28..bdaaa20a21 100644
--- a/internal/compilers.h
+++ b/internal/compilers.h
@@ -210,6 +210,7 @@ __extension__({ \
RB_BUILTIN_TYPE(arg_obj); \
})
#else
+# include "ruby/ruby.h"
static inline int
rb_obj_builtin_type(VALUE obj)
{