[Evolution-hackers] Build failing in the gnome-2.30 branch

[Paul Smith <paul mad-scientist net>]

Hi all; I'm trying to build the gnome-2.30 branch using my makefile and
I'm getting this compile error (last build was successful from this
branch, last week or so):

make[4]: Entering directory `/opt/src/evo/evo-2.30/obj/evolution/modules/network-manager'
  CC     libevolution_module_network_manager_la-evolution-network-manager.lo
  CCLD   libevolution-module-network-manager.la
.libs/libevolution_module_network_manager_la-evolution-network-manager.o: In function `e_network_manager_register_type':
/opt/src/evo/evo-2.30/obj/evolution/modules/network-manager/../../../../evolution/modules/network-manager/evolution-network-manager.c:54: undefined reference to `e_extension_get_type'
.libs/libevolution_module_network_manager_la-evolution-network-manager.o: In function `network_manager_get_shell':
/opt/src/evo/evo-2.30/obj/evolution/modules/network-manager/../../../../evolution/modules/network-manager/evolution-network-manager.c:61: undefined reference to `e_extension_get_type'
/opt/src/evo/evo-2.30/obj/evolution/modules/network-manager/../../../../evolution/modules/network-manager/evolution-network-manager.c:61: undefined reference to `e_extension_get_extensible'
.libs/libevolution_module_network_manager_la-evolution-network-manager.o: In function `e_network_manager_class_init':
/opt/src/evo/evo-2.30/obj/evolution/modules/network-manager/../../../../evolution/modules/network-manager/evolution-network-manager.c:222: undefined reference to `e_extension_get_type'
collect2: ld returned 1 exit status
make[4]: *** [libevolution-module-network-manager.la] Error 1
make[4]: Leaving directory `/opt/src/evo/evo-2.30/obj/evolution/modules/network-manager'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/opt/src/evo/evo-2.30/obj/evolution/modules'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/opt/src/evo/evo-2.30/obj/evolution'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/opt/src/evo/evo-2.30/obj/evolution'

Something missing from the makefile?