extconf.rb in re2-0.7.0

- old
+ new

@@ -9,9 +9,12 @@
 incl, lib = dir_config("re2", "/usr/local/include", "/usr/local/lib")
 
 $CFLAGS << " -Wall -Wextra -funroll-loops"
 
 have_library("stdc++")
+have_header("stdint.h")
+have_func("rb_str_sublen")
+
 if have_library("re2")
 
   # Determine which version of re2 the user has installed.
   # Revision d9f8806c004d added an `endpos` argument to the
   # generic Match() function.