Seems there are still some combo box thing left. A build against recent gtk ends here with:

/usr/bin/ld: ../libseahorse/.libs/libseahorse.a(seahorse-prefs.o): in function on_prefs_keyserver_add_clicked:seahorse-prefs.c:354: error: undefined reference to 'gtk_combo_box_remove_text'
/usr/bin/ld: ../libseahorse/.libs/libseahorse.a(seahorse-prefs.o): in function on_prefs_keyserver_add_clicked:seahorse-prefs.c:356: error: undefined reference to 'gtk_combo_box_append_text'
/usr/bin/ld: ../pgp/.libs/libseahorse-pgp.a(seahorse-gpgme-generate.o): in function seahorse_gpgme_generate_show:seahorse-gpgme-generate.c:438: error: undefined reference to 'gtk_combo_box_remove_text'
/usr/bin/ld: ../pgp/.libs/libseahorse-pgp.a(seahorse-gpgme-generate.o): in function seahorse_gpgme_generate_show:seahorse-gpgme-generate.c:440: error: undefined reference to 'gtk_combo_box_append_text'
/usr/bin/ld: ../ssh/.libs/libseahorse-ssh.a(seahorse-ssh-generate.o): in function on_response:seahorse-ssh-generate.c:172: error: undefined reference to 'gtk_combo_box_get_active_text'
/usr/bin/ld: ../ssh/.libs/libseahorse-ssh.a(seahorse-ssh-generate.o): in function on_change:seahorse-ssh-generate.c:128: error: undefined reference to 'gtk_combo_box_get_active_text'
/usr/bin/ld: ../gkr/.libs/libseahorse-gkr.a(seahorse-gkr-add-item.o): in function on_add_item_response:seahorse-gkr-add-item.c:105: error: undefined reference to 'gtk_combo_box_get_active_text'


I also notice that building against libnotify < 0.7 fails, because the definition of NOTIFY_CHECK_VERSION needs to eat the arguments:

#ifndef NOTIFY_CHECK_VERSION
#define NOTIFY_CHECK_VERSION(x,y,z)  0
#endif