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is it just impossible to use multiple libraries that depend on different OpenCV versions?
I would hazard a guess and answer "yes" here.
This is likely a case of ABI incompatibility, which is very easy to achieve when linking to different versions of the same library within a single binary. Crashes (probably SEGFAULT
s) typically follow.
Note this is not a "ROS problem": you'll have this problem with or without ROS. It's a general problem when working with compiled languages (which support dynamic libraries).