Destdir

Hi everybody

I woul like to ask something. I am working with Qt4 on ubuntu. I have made a .pro file

TEMPLATE = lib
CONFIG += designer plugin release
HEADERS = ../iconeditor/iconeditor.h \
iconeditorplugin.h
SOURCES = ../iconeditor/iconeditor.cpp \
iconeditorplugin.cpp

DESTDIR = $(QTDIR)/plugins/designer

When I run qmake iconeditorplugin.pro I have recieved the following warning:
DESTDIR: Cannot access directory '$(QTDIR)/plugins/designer'

Please help me to resolve the problem.

make sure you don't have permissions problem.

Thank you for your answer. Please could you explain how to repair my permissions problem.
I have enabled my root account writting su in the command line. Then I wrote qmake-qt4 iconeditorplugin.pro. There were no errors. Then I wrote make and I have now libiconeditorplugin.so in my directory where it is placed .pro file. I think that my plugin is ready to use but I don't see this plugin in Qt Designer.
Please help me again.

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Added after 25 minutes:

Thank you. I have resolved my problem.