[sugar] Etoys build broken

[Marco Pesenti Gritti]

It has been broken for a few days now:

/bin/sh /home/marco/sugar-jhbuild/source/squeak/bld/libtool
--mode=compile gcc -DSUGAR -fomit-frame-pointer -DLSB_FIRST=1
-DHAVE_CONFIG_H  -I/home/marco/sugar-jhbuild/source/squeak/bld
-I/home/marco/sugar-jhbuild/source/squeak/platforms/unix/vm
-I/home/marco/sugar-jhbuild/source/squeak/platforms/Cross/vm
-I/home/marco/sugar-jhbuild/source/squeak/platforms/unix/src/vm
[DBUS_CFLAGS] -c -o DBusPlugin.lo
/home/marco/sugar-jhbuild/source/squeak/platforms/unix/src/plugins/DBusPlugin/DBusPlugin.c
gcc -DSUGAR -fomit-frame-pointer -DLSB_FIRST=1 -DHAVE_CONFIG_H
-I/home/marco/sugar-jhbuild/source/squeak/bld
-I/home/marco/sugar-jhbuild/source/squeak/platforms/unix/vm
-I/home/marco/sugar-jhbuild/source/squeak/platforms/Cross/vm
-I/home/marco/sugar-jhbuild/source/squeak/platforms/unix/src/vm
"[DBUS_CFLAGS]" -c
/home/marco/sugar-jhbuild/source/squeak/platforms/unix/src/plugins/DBusPlugin/DBusPlugin.c
 -fPIC -DPIC -DPIC -o DBusPlugin.o
gcc: [DBUS_CFLAGS]: No such file or directory
/home/marco/sugar-jhbuild/source/squeak/platforms/unix/src/plugins/DBusPlugin/DBusPlugin.c:30:23:
error: dbus/dbus.h: No such file or directory