[flext] autotools builders - py/ext

[dmotd]

attached is a patch (svn diff) to add autotools support for py/pyext.. 
it's a revised, edited and ammended version of the script set from pool, 
which adds install directives for data/documentation and makes a few 
changes to the configuration flags.

the relevant flags are follows:
---
   --enable-flext-host     host environment for flext [default=pd]
   --with-pd-headers       path to pd headers
   --with-pd-libdir        pd external install search path [typically
                           PDPATH/extra]
   --with-max-headers      path to max SDK headers
   --with-max-initdir      install path for max init files
   --with-max-helpdir      install path for max help files
   --with-max-libdir       install path for max objects and libraries
   --with-flext-headers    path to the flext headers
                           [default=PREFIX/include/flext]
   --with-flext-libs       path to the flext libraries [default=PREFIX/lib]
   --with-numarray-headers path to the numarray headers
   --with-numeric-headers  path to the numeric headers
   --with-numpy-headers    path to the numpy headers
   --enable-gil            use thread-safe GIL functionality [for >= 
python2.3]
                           [default=no]
   --enable-inofficial     use inofficial pure data functionality 
[default=no]
---

i've tried to make some of the labels a little less ambiguous, separated 
max and pd flags, and removed the need for --libdir as an install 
location (--libdir is not very flexible with autotools when installing 
to non-standard locations, in fact libtool itself is a bit strict with a 
lot of things and doesn't have much builtin scope for plugin 
architectures - read headaches).

in terms of internals, it should detect python and its headers, detect 
the installed buffer support - for numpy it should find its include 
path, numarray will do a dumb guess and numeric - well numeric doesn't 
seem to be setup in pybuffer.cpp (is that a mistake?). there are 
safeguards/warnings and all that other necessary autostuff.

i've tested this on a couple of linux machines and nothing else, but it 
should be ready for other platforms.

i look forward to test results/changes and if things seem positive i'll 
start work on the other libs in the grrrr set and beyond that make a 
template for other projects using flext. hopefully this will be enough 
to get flext libs packaged up in some of the popular linux distros (i 
work with archlinux here and maintain pd packages for it so that'll be a 
given).

cheers,
dmotd

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