export CXXFLAGS="-std=c++11 -stdlib=libc++"
export LDFLAGS="-stdlib=libc++"
link to libc++ or libstdc++
the stl function symbol in object file are different in mac with xcode 7
when use std::vector as a argument
the argument symbol is St6vectorIiSaIi linking to libstdc++
the other is St3__16vectorIiNS6_9allocatorIi
this will cause linking errors
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