This application failed to start because it could not find or load the Qt platform plugin “linuxfb“

[email protected]:~# ./untitled

This application failed to start because it could not find or load the Qt platform plugin "linuxfb".

原因是程式找不多linuxfb這個插件，配置下插件的查找路徑就可以了

解決辦法

export QTDIR=/usr
export QT_QPA_FONTDIR=$QTDIR/lib/fonts
export QT_QPA_PLATFORM_PLUGIN_PATH=$QTDIR/plugins/
export LD_LIBRARY_PATH=$QTDIR/lib:$LD_LIBRARY_PATH
export QT_QPA_PLATFORM=linuxfb:fb=/dev/fb0:size=800x600:mmSize=800x600:offset=0x0:tty=/dev/tty1
           

QT_QPA_PLATFORM_PLUGIN_PATH設定為Qt plugins的真實路徑

不過，最好的辦法是将qt庫安裝到正确目錄。 這個目錄是編譯qt時指定或預設的安裝目錄。執行qmake -v指令，會顯示qt應該安裝在什麼位置，把一套qt放過去，像我這裡把上面的QTDIR設定成/usr/local/qt-5.4.2就好了。

[email protected]:~/work/openssl-1.0.2e$ /usr/local/qt-5.4.2/bin/qmake  -v
QMake version 3.0
Using Qt version 5.4.2 in /usr/local/qt-5.4.2/lib
           

參考：http://www.zhimengzhe.com/linux/288929.html

https://stackoverflow.com/questions/15259900/qt-creator-2-6-2-and-qt-4-8-4-qt-version-is-not-properly-installed