9.3和rails 3.2.13在我的应用程序中创建了PDF,因此我安装了gem安装wkhtmltopdf和gem安装wkhtmltopdf-二进制-v '0.9.9.1',但是我得到了如何解决这个问题的消息unable to convert "\x90" from ASCII-8BIT to UTF-8 for bin/wkhtmltopdf_linux_386, skipping
unable to convertfor wkhtml
当我试图用Project ERROR: Unknown module(s) in QT: positioning构建依赖于QT5的项目时,出现了错误的qmake,我怀疑以前安装的旧QT4安装中可能会出现问题qmake -versionUsing Qt version 5.2.1 in /usr/lib/x86_64-linux-gnu1.如何解决这一错误2.如何完全删除Qt4 (并可能重新安装QT5?