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-rw-r--r--spec/ruby/optional/capi/ext/encoding_spec.c2
-rw-r--r--spec/ruby/optional/capi/ext/rubyspec.h6
2 files changed, 6 insertions, 2 deletions
diff --git a/spec/ruby/optional/capi/ext/encoding_spec.c b/spec/ruby/optional/capi/ext/encoding_spec.c
index 87b97f3a1b..9ab893b86a 100644
--- a/spec/ruby/optional/capi/ext/encoding_spec.c
+++ b/spec/ruby/optional/capi/ext/encoding_spec.c
@@ -94,8 +94,6 @@ static VALUE encoding_spec_rb_default_external_encoding(VALUE self) {
#endif
#ifdef HAVE_RB_ENC_ALIAS
-extern int rb_enc_alias(const char* alias, const char* orig);
-
static VALUE encoding_spec_rb_enc_alias(VALUE self, VALUE alias, VALUE orig) {
return INT2NUM(rb_enc_alias(RSTRING_PTR(alias), RSTRING_PTR(orig)));
}
diff --git a/spec/ruby/optional/capi/ext/rubyspec.h b/spec/ruby/optional/capi/ext/rubyspec.h
index 1ece9541c7..e5a90bfc88 100644
--- a/spec/ruby/optional/capi/ext/rubyspec.h
+++ b/spec/ruby/optional/capi/ext/rubyspec.h
@@ -23,6 +23,10 @@
(RUBY_VERSION_MAJOR == (major) && RUBY_VERSION_MINOR < (minor)) || \
(RUBY_VERSION_MAJOR == (major) && RUBY_VERSION_MINOR == (minor) && RUBY_VERSION_TEENY < (teeny)))
+#if RUBY_VERSION_MAJOR > 2 || (RUBY_VERSION_MAJOR == 2 && RUBY_VERSION_MINOR >= 6)
+#define RUBY_VERSION_IS_2_6
+#endif
+
#if RUBY_VERSION_MAJOR > 2 || (RUBY_VERSION_MAJOR == 2 && RUBY_VERSION_MINOR >= 4)
#define RUBY_VERSION_IS_2_4
#endif
@@ -204,7 +208,9 @@
#define HAVE_RB_DEFAULT_INTERNAL_ENCODING 1
#define HAVE_RB_DEFAULT_EXTERNAL_ENCODING 1
+#ifdef RUBY_VERSION_IS_2_6
#define HAVE_RB_ENC_ALIAS 1
+#endif
#define HAVE_RB_ENC_ASSOCIATE 1
#define HAVE_RB_ENC_ASSOCIATE_INDEX 1
#define HAVE_RB_ENC_CODEPOINT_LEN 1