osx下安裝quadprog和qpsolvers遇到的問題

OSX使用qpsolver的時候報錯

File "quadprog/quadprog.pyx", line 91, in quadprog.solve_qp

反覆pip install/uninstall後確定問題出現在qpsolvers包

    clang: warning: libstdc++ is deprecated; move to libc++ with a minimum deployment target of OS X 10.9 [-Wdeprecated]
    ld: library not found for -lstdc++
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    error: command 'g++' failed with exit status 1

使用pip install qpsolvers會報以上錯誤。原因是OS X（我使用的10.15.7）下lib的問題。

使用一下命令即可
sudo CFLAGS=-stdlib=libc++ pip install qpsolvers