Replace Boost_DIR with Boost_INCLUDE_DIR

[gmh5225]

No description provided.

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[r0qs]

Hi @gmh5225, could you clarify what exactly is incorrect in the current configuration? Could you provide more details? Are you encountering any specific issues with the current settings?

[gmh5225]

I found that using -DBoost_DIR actually fails to compile on Windows.

Using -DBoost_ROOT and -DBoost_INCLUDE_DIR is the more modern and recommended way since CMake 3.12+.

@r0qs

[cameel]

Just a heads up: please make sure this works also with Boost 1.67, which is the oldest version we still support. This is not covered by our CI (#15136).

[gmh5225]

The minimum Boost version required on Windows is 1.77. I have tested it, and it works. The documentation fixes are specifically for compiling on Windows.