* file.c (rb_str_normalize_ospath):

HFS Plus (Mac OS Extended) uses a variant of Normal Form D in which
  U+2000 through U+2FFF, U+F900 through U+FAFF, and U+2F800 through
  U+2FAFF are not decomposed (this avoids problems with round trip
  conversions from old Mac text encodings).
  http://developer.apple.com/library/mac/qa/qa1173/_index.html
  Therefore fix r42457 to exclude the range.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42498 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

internal.h

@@ -513,6 +513,11 @@ VALUE rb_big_mul_karatsuba(VALUE x, VALUE y);
 VALUE rb_big_mul_toom3(VALUE x, VALUE y);
 VALUE rb_big_sq_fast(VALUE x);
 
+/* file.c */
+#ifdef __APPLE__
+VALUE rb_str_normalize_ospath(const char *ptr, long len);
+#endif
+
 /* io.c */
 void rb_maygvl_fd_fix_cloexec(int fd);