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-rw-r--r--ext/unicorn_http/ext_help.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/ext/unicorn_http/ext_help.h b/ext/unicorn_http/ext_help.h
index 83e80a0..8df2d80 100644
--- a/ext/unicorn_http/ext_help.h
+++ b/ext/unicorn_http/ext_help.h
@@ -33,6 +33,10 @@ static void rb_18_str_set_len(VALUE str, long len)
 #  endif
 #endif /* ! defined(OFFT2NUM) */
 
+#ifndef HAVE_RB_STR_MODIFY
+#  define rb_str_modify(x) do {} while (0)
+#endif
+
 static inline int str_cstr_eq(VALUE val, const char *ptr, size_t len)
 {
   return (RSTRING_LEN(val) == len && !memcmp(ptr, RSTRING_PTR(val), len));