How to compile C++ program for older version of MacOS?

here are my build steps:

conan install . --build=missingcmake --preset conan-defaultcmake --build --preset conan-release

this results in a binary that is compatible with only the current (last) version of MacOS

otool -l mybinplatform 1    minos 14.5      sdk 14.5

How to change this builds steps to compile for MacOS 10.14?