看了OBS官网在MAC上的编译流程 但是卡在下面叙述 NOTE: Qt5 can also be downloaded/installed via the Qt website, though keep in mind that you will have to set the QTDIR environment variable to the Qt5 build base directory. For example: export QTDIR=/usr/local/opt/qt 理解不了这段话的意思 请问这边该怎麽做？ --

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