Declared include dir needed to find RVO header file in CMakeLists.txt #2
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I was adding the RVO library as a git submodule to my project, and in order to find the library's header file from my own code during build, I needed to add this line.
I think the issue was similar to this: https://stackoverflow.com/q/38022700
Not sure if there are more elegant ways to solve this, though.