Location of the host Qt installation when cross-compiling.
Note: This variable is in technology preview and may change in future releases.
When cross-compiling, this must be set to the install location of Qt for the host platform. It is used to locate tools to be run on the host (moc, rcc, androiddeployqt, and so on).
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https://doc.qt.io/qt-6.2/cmake-variable-qt-host-path.html