Comment 13 for bug 916477

this seems to be wrong:

  CCLD lightdm-gtk-greeter
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/liblightdm-gobject-1.a(liblightdm_gobject_1_la-user.o): undefined reference to symbol 'g_file_monitor'

investigate why the static lib is used, and not the shared one.