how to use static lib on linux

[langziyang]

i compiled static taglib,i got libtag.a file.i copy this file to project dir.and i added some code in .pro

TAGLIBDIR = /usr/local
INCLUDEPATH += $$(TAGLIBDIR)/include
LIBS += libtag.a

TAGLIBDIR = /usr/local
INCLUDEPATH += $$(TAGLIBDIR)/include
LIBS += libtag.a

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whe i run my pro.the tell me:

error: libtag.a: No such file or directory

error: libtag.a: No such file or directory

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why?and how?