ld: library not found for -lqt-mt

I tried to build a QT program, but I g开发者_如何学JAVAot this error: "ld: library not found for -lqt-mt".

please what is this lib, and how I can fix this problem.

thanks for your help.

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Please see this: http://ubuntuforums.org/showthread.php?t=558637