[PD] building all external on linux

[Thomas Grill]

>> huh? you mean theres a m_pd.h in src/ or build/OS? sounds like a bad
>> idea..
>>
> exactly
> m_pd.h didn't really change from 0.37 to 0.38, not sure about m_imp.h /
> g_canvas.h, though ... butthey are private headers and shoudn't be used
> by externals, althought e.g. flext or cyclone _are_ using them. (so
> they are de facto public) ...
>
they (or a part of their contents) should be made public as soon as 
possible anyway, because how would one program PD gui objects (like 
Yves') without them?

best greetings,
Thomas