pro、pri、prf、prl文件(qmake)

参考

• http://blog.csdn.net/dbzhang800/article/details/6348432
• qmake manual:qmake-advanced-usage.html
• qmake manual:qmake-variable-reference.html

• http://www.qtcentre.org/wiki/index.php?title=Undocumented_qmake