在树莓派上安装了官方的raspbian系统。为了在能在上面开发程序，在系统上安装了qt4 。参考链接http://qt-project.org/wiki/apt-get_Qt4_on_the_Raspberry_Pi
apt-get
Firstly I got the development tools needed by Qt Creator in the hope it would be less heavy for the Pi to download separately.
sudo apt-get install qt4-dev-tools
Then I went for Qt Creator
sudo apt-get install Qtcreator
I also installed
sudo apt-get install gcc
sudo apt-get install xterm
sudo apt-get install git-core
sudo apt-get install subversion
this gives as a result Qt Creator 2.5 with Qt 4.8.1 32 bit
Problem : no toolchain.
We can only compile for remote embedded devices and this is not the case here, because we are on the Pi and not remotely accessing it.
I added a gcc toolchain
Options > build & run > tab tool chain > button add
Choose GCC
Then set compiler path : /usr/bin/arm-linux-gnueabihf-gcc-4.6
Debugger : /usr/bin/gdb
Mkspec : default
Qt Creator seems to detect that we are going to deploy on a remote target.
To fix this :
Go to menu help > about plugins
Uncheck device support > remote linux
Restart Qt Creator
Go to tools > options TAB > build & run > Qt versions > add “/usr/bin/qmake-qt4”
It will then show up as a desktop project in the project wizard instead of embedded.
下载的raspbian系统比较新，里头已经内置了GCC，跟着网站的步骤走，很容易就能完成QT4的安装。注意sudo apt-get install Qtcreator中Qtcreator首字母要小写，要不然树莓派的服务器会找不到安装程序提示错误。
以前在做linux QT开发中 喜欢直接在window上用UE进行编辑，然后ftp到虚拟机中。同样可以用这种方式对树莓派进行qt的开发。在我下的raspbian中没有安装ftp。
第一步 通过云安装，sudo apt-get install vsftpd。
第二步 对ftp进行配置，sudo vim /etc/vsftpd.conf。anonymous_enable=NO,local_enable=YES,write_enable=YES,local_umask=022。
第三步 重启ftp服务 sudo service vsftpd restart
这样就能在UE上编写qt程序了。不过程序在树莓派上直接编译还是比较慢的，建议还是使用交叉编译的方式。
PS：安装qt需要比较大的空间，建议使用4G以上的SD卡，并且在raspi-config中Expand Filesystem使系统使用整张SD卡的大小，要不然只会分配2G多供系统使用。
