The files dll and lib_####.a are generated at build-desktop folder.
But I dont see my custom widgets, and I copy the .a and dll files by hand to qt\plugins\designer
My pro file is the next :

Qt Code: 
  1. QT       += core gui
  2.  
  3.  TEMPLATE    = lib
  4.  
  5.  CONFIG += designer \
  6.            plugin \
  7.            release \
  8.            warn_on \
  9.  
  10.  TARGET  = gui_plugins
  11.  
  12.  target.path += $$[QT_INSTALL_PLUGINS]/designer
  13.  INSTALLS += target
  14.  
  15.  INCLUDEPATH += ../AnalogWidgets/analogwidgets/analogwidgets \
  16.                 ../AnalogWidgets/analogwidgets/code
  17.  
  18.  HEADERS +=    \
  19.             ../AnalogWidgets/analogwidgets/analogwidgets/wallclock.h \
  20.             ../AnalogWidgets/analogwidgets/analogwidgets/led.h \
  21.             ../AnalogWidgets/analogwidgets/plugins/led_plugin.h \
  22.             ../AnalogWidgets/analogwidgets/plugins/wallclock_plugin.h \            
  23.             ../AnalogWidgets/analogwidgets/analogwidgets/widgetwithbackground.h
  24.  
  25.  SOURCES += \
  26.             ../AnalogWidgets/analogwidgets/code/wallclock.cpp \
  27.             ../AnalogWidgets/analogwidgets/code/widgetwithbackground.cpp \
  28.             ../AnalogWidgets/analogwidgets/code/led.cpp \
  29.             ../AnalogWidgets/analogwidgets/plugins/wallclock_plugin.cpp \
  30.             ../AnalogWidgets/analogwidgets/plugins/led_plugin.cpp
  31.  
  32.  FORMS +=
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Any help ?