On Ubuntu Oneiric (fresh install with Universe repo enabled):

/usr/bin/ld: /tmp/ccDHQ6ub.o: undefined reference to symbol 
'boost::signals::trackable::~trackable()'
/usr/bin/ld: note: 'boost::signals::trackable::~trackable()' is defined in DSO 
/usr/lib/libboost_signals.so.1.46.1 so try adding it to the linker command line
/usr/lib/libboost_signals.so.1.46.1: could not read symbols: Invalid operation
collect2: ld returned 1 exit status

objdump -x /usr/lib/libwt.so
  NEEDED               libboost_thread.so.1.46.1     
  NEEDED               libboost_regex.so.1.46.1      
  NEEDED               libboost_signals.so.1.46.1    
  NEEDED               libboost_system.so.1.46.1     
  NEEDED               libboost_date_time.so.1.46.1  
  NEEDED               libboost_filesystem.so.1.46.1 
  NEEDED               libhpdf-2.1.0.so              
  NEEDED               libGraphicsMagick.so.3        
  NEEDED               libpthread.so.0               
  NEEDED               libstdc++.so.6                
  NEEDED               libm.so.6                     
  NEEDED               libgcc_s.so.1                 
  NEEDED               libc.so.6                     

objdump -x /usr/lib/libwthttp.so
  NEEDED               libwt.so.29                       
  NEEDED               libz.so.1                         
  NEEDED               libssl.so.1.0.0                   
  NEEDED               libcrypto.so.1.0.0                
  NEEDED               libboost_thread.so.1.46.1         
  NEEDED               libboost_filesystem.so.1.46.1     
  NEEDED               libboost_program_options.so.1.46.1
  NEEDED               libpthread.so.0                   
  NEEDED               libboost_system.so.1.46.1         
  NEEDED               libstdc++.so.6                    
  NEEDED               libgcc_s.so.1                     
  NEEDED               libc.so.6

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https://bugs.launchpad.net/bugs/900354

Title:
  libwt requires an explicit link to libboost_signals

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