diff -crB calibre/setup/extensions.py calibre_fixed/setup/extensions.py
*** calibre/setup/extensions.py	Fri Oct  2 07:28:03 2009
--- calibre_fixed/setup/extensions.py	Sat Oct  3 23:20:22 2009
***************
*** 102,108 ****
                      libraries=['podofo'],
                      lib_dirs=[podofo_lib],
                      inc_dirs=[podofo_inc],
!                     error=podofo_error),
  
      Extension('pictureflow',
                  ['calibre/gui2/pictureflow/pictureflow.cpp'],
--- 102,109 ----
                      libraries=['podofo'],
                      lib_dirs=[podofo_lib],
                      inc_dirs=[podofo_inc],
!                     error=podofo_error,
! 		    optional=[True]),
  
      Extension('pictureflow',
                  ['calibre/gui2/pictureflow/pictureflow.cpp'],