Fixing boost for a problem related to a "class R shadowing template...".

Taken from: http://wiki.freebsd.org/BoostPortingProject

svn path=/nixpkgs/trunk/; revision=15146

pkgs/development/libraries/boost/1.38.0.nix

@@ -37,6 +37,8 @@ stdenv.mkDerivation {
     sha256 = "0rk044s4m7l4sma6anml34vxcd9w0fzcy1cy7csbzynjyida9qry";
   };
 
+  patches = [ ./classr.patch ];
+  
   buildInputs = [icu expat zlib bzip2 python];
 
   preBuild = ''

pkgs/development/libraries/boost/classr.patch

@@ -0,0 +1,15 @@
+Taken from http://wiki.freebsd.org/BoostPortingProject
+--- boost1.38/boost/function/function_template.hpp.orig   2008-10-16 17:21:50.000000000 +0400
++++ boost1.38_2/boost/function/function_template.hpp        2009-03-25 04:12:15.000000000 +0300
+@@ -950,10 +950,10 @@
+           f.vtable->manager(f.functor, this->functor,
+                             boost::detail::function::move_functor_tag);
+ 		  f.vtable = 0;
+-#if !defined(BOOST_NO_EXCEPTIONS)      
+         } else {
+           clear();
+         }
++#if !defined(BOOST_NO_EXCEPTIONS)      
+       } catch (...) {
+         vtable = 0;
+         throw;