Qt Project
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https://qt.mirror.constant.com/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://mirrors.ukfast.co.uk/sites/qt.io/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://mirrors.20i.com/pub/qt.io/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://ftp.nluug.nl/languages/qt/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://mirror.netcologne.de/qtproject/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://qt-mirror.dannhauer.de/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://ftp.fau.de/qtproject/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://mirrors.dotsrc.org/qtproject/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://ftp.acc.umu.se/mirror/qt.io/qtproject/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://www.nic.funet.fi/pub/mirrors/download.qt-project.org/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://qtproject.mirror.liquidtelecom.com/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://mirrors.sau.edu.cn/qt/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://mirror.bjtu.edu.cn/qt/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://mirrors.ustc.edu.cn/qtproject/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://mirrors.sjtug.sjtu.edu.cn/qt/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://ftp.jaist.ac.jp/pub/qtproject/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz
https://ftp.yz.yamagata-u.ac.jp/pub/qtproject/archive/qt/5.15/5.15.0/submodules/qtserialport-everywhere-src-5.15.0.tar.xz