clang and c++11 question

Quark unixuser2000-fbsd at
Tue Aug 27 07:28:15 UTC 2013

% uname -a
FreeBSD 9.2-RC3 FreeBSD 9.2-RC3 #0 r254795: Sat Aug 24 20:25:04 UTC 2013     root at  amd64

% clang++ --version
FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610
Target: x86_64-unknown-freebsd9.2
Thread model: posix

clang 3.3 is C++11 feature complete, but it fails to find <future> and/or <thread> headers.
since it is looking in system compiler path, which is old gcc4.2, not C++11 ready

how to make clang refer headers from gcc48's installation( via pkg_add)?

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