python_PYTHON not triggering rules for generated code

[cb132]

I am using Google protobuf to generate C++ and/or python code, and compiling
the python using python_PYTHON - but it's not working.

Makefile.am looks like this;

<code>
if GEN_PROTOC_CPP
  include $(srcdir)/Makefile-cpp.am
endif
if GEN_PROTOC_PY
  include $(srcdir)/Makefile-py.am
endif
</code>

Makefile-py.am looks like this;

<code>
## list of .proto files
include $(srcdir)/Protos.am

## proto compiler support
include $(top_srcdir)/.am/protoc.am

##  compile python
python_PYTHON = \
    __init__.py \
    $(PROTO_PYS) 
</code>

Protos.am provides a list of protos, and rules;

<code>
PROTO_PYS=$(PROTOS:.proto=_pb2.py)

MsgHeaderProto_pb2.py : MsgHeaderProto.proto
        @echo '  PROTOP MsgHeaderProto.proto'
        protoc --python_out=.. -$I(topsrcdir)  $(PROTOC_PYFLAGS) $<
</code>

Problem one is the .py rules are never triggered to generate the .py files.  
The C++ makefile is very similar, and works fine.

I have tried using BUILT_SOURCES, but it does not work if I use

<code>BUILT_SOURCES = $(PROTO_PYS) </code>

and it does not work unless it's in Makefile.am.  Since python_PYTHON
doesn't seem to actually compile until I do a 'make install', I've also
tried

<code>all-local : $(PROTO_PYS) <code>

What am I missing?
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