diff -wruN -x '*~' -x '*.o' -x '*.a' -x '*.so' -x '*.so.[0-9]' -x autom4te.cache -x .deps -x .libs ../orig-vim74/src/if_ruby.c ./src/if_ruby.c
--- ../orig-vim74/src/if_ruby.c	2013-05-20 12:47:48.000000000 +0200
+++ ./src/if_ruby.c	2014-01-10 09:04:58.926094655 +0100
@@ -96,6 +96,10 @@
 # define rb_num2int rb_num2int_stub
 #endif
 
+# if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER > 20
+# define rb_gc_writebarrier_unprotect_promoted rb_gc_writebarrier_unprotect_promoted_stub
+# endif
+
 #include <ruby.h>
 #ifdef RUBY19_OR_LATER
 # include <ruby/encoding.h>
@@ -213,6 +217,9 @@
 # define rb_obj_alloc			dll_rb_obj_alloc
 # define rb_obj_as_string		dll_rb_obj_as_string
 # define rb_obj_id			dll_rb_obj_id
+# if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER > 20
+# define rb_gc_writebarrier_unprotect_promoted dll_rb_gc_writebarrier_unprotect_promoted
+# endif
 # define rb_raise			dll_rb_raise
 # define rb_str_cat			dll_rb_str_cat
 # define rb_str_concat			dll_rb_str_concat
@@ -317,6 +324,9 @@
 static VALUE (*dll_rb_obj_alloc) (VALUE);
 static VALUE (*dll_rb_obj_as_string) (VALUE);
 static VALUE (*dll_rb_obj_id) (VALUE);
+# if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER > 20
+static void (*dll_rb_gc_writebarrier_unprotect_promoted) (VALUE);
+# endif
 static void (*dll_rb_raise) (VALUE, const char*, ...);
 # if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 18
 static VALUE (*dll_rb_string_value) (volatile VALUE*);
@@ -393,6 +403,12 @@
     return dll_rb_num2int(x);
 }
 #  endif
+#  if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER > 20
+void rb_gc_writebarrier_unprotect_promoted_stub(VALUE obj)
+{
+    dll_rb_gc_writebarrier_unprotect_promoted(obj);
+}
+#  endif
 #  if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 20
 VALUE
 rb_float_new_in_heap(double d)
@@ -462,6 +478,9 @@
     {"rb_obj_alloc", (RUBY_PROC*)&dll_rb_obj_alloc},
     {"rb_obj_as_string", (RUBY_PROC*)&dll_rb_obj_as_string},
     {"rb_obj_id", (RUBY_PROC*)&dll_rb_obj_id},
+# if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER > 20
+    {"dll_rb_gc_writebarrier_unprotect_promoted", (RUBY_PROC*)&dll_rb_gc_writebarrier_unprotect_promoted},
+# endif
     {"rb_raise", (RUBY_PROC*)&dll_rb_raise},
 # if defined(DYNAMIC_RUBY_VER) && DYNAMIC_RUBY_VER >= 18
     {"rb_string_value", (RUBY_PROC*)&dll_rb_string_value},