Thanks. I think I have the static plugins because in the "plugins/imageformats" I have:
libqgif.a, libqjpeg.a, libqmng.a, libqsvg.a, libqtiff.a.

In my main.cpp I declare:
Qt Code: 
  1. #include <QtPlugin>
  2.  Q_IMPORT_PLUGIN(libqjpeg)
  3.  Q_IMPORT_PLUGIN(libqgif)
  4.  Q_IMPORT_PLUGIN(libqmng)
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And myproject.pro has:
Qt Code: 
  1. CONFIG += staticlib
  2. QTPLUGIN += libqjpg \
  3.                      libqgif \
  4.                      libqmng
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I also put the static plugins files in the same folder with my .pro file. Still the compiler says that "-llibjpg" not found. What I am doing wrong? Compilation works if I don't make the above declarations in the main.cpp and myproject.pro file.