Mark BROKEN of FreeBSD < 10:

/usr/local/lib/libwebkitgtk-1.0.so.0: undefined reference to `std::chrono::_V2::steady_clock::now()@GLIBCXX_3.4.19'
/usr/local/lib/libjavascriptcoregtk-1.0.so.0: undefined reference to `std::chrono::_V2::system_clock::now()@GLIBCXX_3.4.19'
collect2: error: ld returned 1 exit status

This is standard C++11, but there is a problem with stdlib.

Note: now it could be built with clang, but the produced binaries don't
behave correctly.