That did it, thanks. the project was originated under CCS4
Perhaps you can shed some light on this warning that I get for every IQmath function I use:
Description Resource Path Location Type
#16002-D build attribute vendor section TI missing in "C:/vss_work/acu2803x/acu410028dev/Project/../../IQmath/lib/IQmath.lib<IQ12div.obj>": compatibility cannot be determined acu410028dev C/C++ Problem
the consensus seems to be to ignore it, which is fine.