export QT_QPA_FONTDIR=/usr/share/fonts/truetype

在Ubuntu中，可以在/usr/share/fonts/truetype目录下找到下载的字体库。如果你想将字体库拷贝到imx6板子的/usr/lib/fonts/目录中，可以按照以下步骤进行操作：首先，将需要的字体库（比如wqy-microhei.ttc）复制到imx6板子的/usr/lib/fonts/目录中。然后，使用sudo vi /etc/profile命令编辑/etc/profile文件。在文件中添加以下内容：

export QT_QPA_FONTDIR=/usr/share/fonts/truetype

保存文件并退出编辑器。这样，你就将QT_QPA_FONTDIR环境变量设置为/usr/share/fonts/truetype目录。这样，Qt应用程序就能够找到并使用该目录下的字体库了。请注意，这只是一种配置方法，具体的路径和文件名可能会有所不同，取决于你的系统设置和字体库的位置。\[1\]
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