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I finally found th eanswer to this problem. Has nothing to do with open/cv. There is a reguirement that the list of ".o" files (inputs) and the output file (-o whatever) appear before any -L's or -l's in the command line of some versions of gcc/g++. In eclipse this means putting the ${flags} variable in the command template LAST instead of second and it means getting all the libraries properly identified, including pkg-config libraries, in the properties for the project.