Boost 1.40.0 still supported?

Hi,

On an Ubuntu 10.04.4 LTS system (x86_64) Blender no longer builds, due
to an error related to boost. Is Boost 1.40.0 not supported anymore?
It's the version of Boost included with 10.04.4 LTS.

...
[ 85%] Building CXX object
intern/cycles/util/CMakeFiles/cycles_util.dir/util_cache.cpp.o
/home/paulmlocal/c/blender-svn/intern/cycles/util/util_cache.cpp: In
member function ‘void ccl::Cache::clear_except(const std::string&, const
std::set<std::basic_string<char, std::char_traits<char>,
std::allocator<char> >, std::less<std::basic_string<char,
std::char_traits<char>, std::allocator<char> > >,
std::allocator<std::basic_string<char, std::char_traits<char>,
std::allocator<char> > > >&)’:
/home/paulmlocal/c/blender-svn/intern/cycles/util/util_cache.cpp:118:
error: ‘struct std::basic_string<char, std::char_traits<char>,
std::allocator<char> >’ has no member named ‘string’
make[2]: ***
[intern/cycles/util/CMakeFiles/cycles_util.dir/util_cache.cpp.o] Error 1
make[1]: *** [intern/cycles/util/CMakeFiles/cycles_util.dir/all] Error 2
make: *** [all] Error 2

Looks like this change to use .string() was introduced here:

------------------------------------------------------------------------
r48836 | nazgul | 2012-07-11 16:48:47 +0200 (Wed, 11 Jul 2012) | 8 lines

Patch #32074: Fix compilation with boost 1.50