Please share more details about how you are building your project. For reference there is a CMake example, repo "depthai-core-example"
Also, try to make an minimum example where this can be reproduced - so we can test this over at our end as well if it turns out to be more convoluted than expected
It might be that INPUT is defined by some other include. Try minimizing that by only including depthai for starters and continue from there.
What are some others libraries you are including?