I got the following error trying to build exo from git under Xubuntu 12.10:

make[2]: ingresso nella directory "/home/prova/Xfce/exo/exo"
  CC     libexo_1_la-exo-icon-view.lo
In file included from exo-icon-view.c:571:0:
../exo/exo-icon-view-accessible.c: In function 'exo_icon_view_item_accessible_info_new':
../exo/exo-icon-view-accessible.c:1121:52: error: declaration of 'index' shadows a global declaration [-Werror=shadow]
../exo/exo-icon-view-accessible.c: In function 'exo_icon_view_accessible_find_child':
../exo/exo-icon-view-accessible.c:1163:49: error: declaration of 'index' shadows a global declaration [-Werror=shadow]
../exo/exo-icon-view-accessible.c: In function 'exo_icon_view_accessible_ref_child':
../exo/exo-icon-view-accessible.c:1184:48: error: declaration of 'index' shadows a global declaration [-Werror=shadow]
../exo/exo-icon-view-accessible.c: In function 'exo_icon_view_accessible_model_row_changed':
../exo/exo-icon-view-accessible.c:1356:8: error: declaration of 'index' shadows a global declaration [-Werror=shadow]
../exo/exo-icon-view-accessible.c: In function 'exo_icon_view_accessible_model_row_inserted':
../exo/exo-icon-view-accessible.c:1407:8: error: declaration of 'index' shadows a global declaration [-Werror=shadow]
../exo/exo-icon-view-accessible.c: In function 'exo_icon_view_accessible_model_row_deleted':
../exo/exo-icon-view-accessible.c:1452:8: error: declaration of 'index' shadows a global declaration [-Werror=shadow]
../exo/exo-icon-view-accessible.c: In function 'exo_icon_view_accessible_ref_accessible_at_point':
../exo/exo-icon-view-accessible.c:1772:8: error: declaration of 'index' shadows a global declaration [-Werror=shadow]
../exo/exo-icon-view-accessible.c: In function 'exo_icon_view_accessible_ref_selection':
../exo/exo-icon-view-accessible.c:1843:8: error: declaration of 'index' shadows a global declaration [-Werror=shadow]
cc1: all warnings being treated as errors
make[2]: *** [libexo_1_la-exo-icon-view.lo] Errore 1
make[2]: uscita dalla directory "/home/prova/Xfce/exo/exo"
make[1]: *** [install] Errore 2
make[1]: uscita dalla directory "/home/prova/Xfce/exo/exo"
make: *** [install-recursive] Errore 1