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-rw-r--r--include/ruby/encoding.h4
-rw-r--r--include/ruby/io.h4
2 files changed, 8 insertions, 0 deletions
diff --git a/include/ruby/encoding.h b/include/ruby/encoding.h
index e6ceb19cdf..0c7e1e3d6a 100644
--- a/include/ruby/encoding.h
+++ b/include/ruby/encoding.h
@@ -12,6 +12,10 @@
#ifndef RUBY_ENCODING_H
#define RUBY_ENCODING_H 1
+#ifdef RUBY_INTERNAL_H
+#error "Include this file before internal.h"
+#endif
+
#if defined(__cplusplus)
extern "C" {
#if 0
diff --git a/include/ruby/io.h b/include/ruby/io.h
index 60d6f6d32e..cde932ff32 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -12,6 +12,10 @@
#ifndef RUBY_IO_H
#define RUBY_IO_H 1
+#ifdef RUBY_INTERNAL_H
+#error "Include this file before internal.h"
+#endif
+
#if defined(__cplusplus)
extern "C" {
#if 0