We had such warnings from automake:
modules/dbus/Makefile.am:63: variable `dbus_la_SOURCES' is defined but no program or
modules/dbus/Makefile.am:63: library has `dbus_la' as canonical name (possible typo)
[...]
header_HEADERS = dbusbind.h
-dbus_la_SOURCES = dbusbind.c
+dbusbind_la_SOURCES = dbusbind.c
-nodist_dbus_la_SOURCES = dbusbind.doc.c
+nodist_dbusbind_la_SOURCES = dbusbind.doc.c
-dbus_la_CFLAGS = $(AM_CFLAGS) -DEMOD_SXE_DBUS
+dbusbind_la_CFLAGS = $(AM_CFLAGS) -DEMOD_SXE_DBUS
CLEANFILES = $(BUILT_SOURCES) auto-autoloads.el{,c} libsxe-dbus.a