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Linking CXX executable gen-class-map
/usr/lib/gcc/x86_64-linux-gnu/4.8/libstdc++.a(functexcept.o): In function `std::__throw_logic_error(char const*)':
(.text._ZSt19__throw_logic_errorPKc+0x0): multiple definition of `std::__throw_logic_error(char const*)'
../../../third-party/folly/libfolly.a(FunctionalExcept.cpp.o):FunctionalExcept.cpp:(.text+0x90): first defined here
/usr/lib/gcc/x86_64-linux-gnu/4.8/libstdc++.a(functexcept.o): In function `std::__throw_length_error(char const*)':
(.text._ZSt20__throw_length_errorPKc+0x0): multiple definition of `std::__throw_length_error(char const*)'
../../../third-party/folly/libfolly.a(FunctionalExcept.cpp.o):FunctionalExcept.cpp:(.text+0x0): first defined here
/usr/lib/gcc/x86_64-linux-gnu/4.8/libstdc++.a(functexcept.o): In function `std::__throw_out_of_range(char const*)':
(.text._ZSt20__throw_out_of_rangePKc+0x0): multiple definition of `std::__throw_out_of_range(char const*)'
../../../third-party/folly/libfolly.a(FunctionalExcept.cpp.o):FunctionalExcept.cpp:(.text+0x120): first defined here
collect2: error: ld returned 1 exit status
make[2]: *** [hphp/tools/bootstrap/gen-class-map] Error 1
make[1]: *** [hphp/tools/bootstrap/CMakeFiles/gen-class-map.dir/all] Error 2
make: *** [all] Error 2