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VAR = foobar => Assign value to variable when qmake is run$$VAR => QMake variable's value at the time qmake is run$${VAR} => QMake variable's value at the time qmake is run (identical but enclosed to separate from surrounding text)$(VAR) => Contents of an Environment variable at the time Makefile (not qmake) is run$$(VAR) =>Contents of an Environment variable at the time qmake (not Makefile) is run转载地址：http://ozxdi.baihongyu.com/