(moving this thread to pd-dev)
that could turn out to be one of the meanest bugs in pd history. Vincent, Ian, Ben, did you also "make install" your built pd, or just run it from the bin folder?
and please make sure, to remove ./src/makefile of oyu are using the autobuild build system ...
So, most probably, you linked your externals (flext-based, but also others) against the new version (in src), but ran it with an old one in bin. This produces the described error for me, too.
thomas: the odd thing is ... i can load most of the externals, that are compiled against devel with pd-0.38-4 ...
the only error messages i get are undefined symbols: /home/tim/pd/extra/volctl~.pd_linux: /home/tim/pd/extra/volctl~.pd_linux: undefined symbol: getalignedbytes
/home/tim/pd/extra/py.pd_linux: /home/tim/pd/extra/py.pd_linux: undefined symbol: inlet_settip
/home/tim/pd/extra/xsample.pd_linux: /usr/local/lib/libflext.so: undefined symbol: garray_updatetime
which is perfectly fine, since they are the functions that are specific to devel ...
it _could_ be related to the build system, but i somehow have there feeling, that there is something else ... still, no way to prove it for me at the moment ...
cheers ... tim