[GEM-dev] question on writing GEM externals

[Sebastian Heymann]

Hello,

i am pretty new to PD and GEM but i love it and i want to use it form 
some
project i am going to work on.
so, lets get to the point. i have to write an external for PD which 
uses GEM
to make some image processing. i managed to write a simple external for
PD which was not very hard. but i could not yet get a GEM external up 
and running.
i am working on macosx and windows.

my latest work ended up in a lot of unresolved externals while PD is 
trying to
load my external. i simply took the pix_blur class, changed it 
minimally and
tried to compile it using the following lines:

g++ -o pix_myblur.o -c pix_myblur.cpp -I../src
g++ -bundle -undefined suppress -flat_namespace -o pix_myblur.pd_darwin 
pix_myblur.o

running "./pd  -lib Gem -lib pix_myblur" results in the following:

dyld: ./pd Undefined symbols:
__ZN11imageStruct5clearEv
__ZN7GemBase11setModifiedEv
__ZN7GemBase17obj_setupCallbackEP6_class
__ZN7GemBase17realStopRenderingEv
__ZN7GemBaseD2Ev
__ZN9CPPExtern16setCPPObjectNameEPc
__ZN9CPPExtern8m_holderE
__ZN9GemPixObj10postrenderEP8GemState
__ZN9GemPixObj12processImageER11imageStruct
__ZN9GemPixObj14setPixModifiedEv
__ZN9GemPixObj15processRGBImageER11imageStruct
__ZN9GemPixObj17obj_setupCallbackEP6_class
__ZN9GemPixObj6renderEP8GemState
__ZN9GemPixObjC2Ev
__ZTV9GemPixObj
__ZnwmPvS_
Trace/BPT trap


well, what did i forget? if somebody has a little makefile or hint, i 
would be
very thankful. how can i load the Gem.pd_darwin symbols in my external,
or do i have to do it?
Thank you in advance.

Sebastian