Digging into ./configure have found that the system look for gtk+2.0 :

TRAY_MONITOR_CPPFLAGS=`$PKGCONFIG --cflags gtk+-2.0'

and $PKGCONFIG = 
/local/download/bacula/compil/bacula/depkgs-qt/qt4/bin/pkg-config

Manually in a terminal, pkg-config --cflags gtk+-2.0 return :
-I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0
....................

Manually in a terminal, 
/local/...../bacula/compil/bacula/depkgs-qt/qt4/bin/pkg-config --cflags gtk+
return : ""

in ./configure, pkg-config --cflags gtk+-2.0 return : ""
and TRAY_MONITOR_CPPFLAGS=`pkg-config --cflags gtk+-2.0` is set to null

in ./configure, /local/...../bacula/compil/bacula/depkgs-qt/qt4/bin/pkg-config 
      --cflags  gtk+ 
return : ""




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