Hi Sarah! Thank you very much for your very prompt reply. I gave it a try today, and now am stuck in a different place I'm pretty good at this, aren't I!? Today I tried libSBML 4.2.0 (latest stable release?) and SBMLToolbox 3.1.0 (as you recommended) I added the MATLAB's mex to my path, and set the CFLAGS and LDFLAGS as described in the readme file. My first attempt gives the error Warning: You are using gcc version "4.4.4-14ubuntu5)". The version currently supported with MEX is "4.3.4". For a list of currently supported compilers see: http://www.mathworks.com/support/compilers/current_release/ So, I went to d/l gcc 4.3.5 (I couldn't find 4.3.4), and tried it again. The gcc warning is now replaced by: mex -I/usr/local/include -I/usr/local/include -L/usr/local/lib -L/usr/local/lib OutputSBML.c -lsbml /usr/bin/ld: cannot find -lstdc++ collect2: ld returned 1 exit status mex: link of ' "OutputSBML.mexa64"' failed. make: *** [OutputSBML.mexglx] Error 1 I saw in a different thread that SBMLToolbox 3.0.0 is not compatible with 4.0.0? Is it that I only need to change the version that I install? Thanks again! Celine
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