Worked on modernizing the build system for the open-telemetry/opentelemetry-cpp repository by introducing support for the CXX26 C++ standard. This involved updating CMake-based build configurations to recognize and correctly handle CXX26, ensuring compatibility with newer toolchains and standard library versions. The work included refining error messaging to help developers quickly identify and resolve configuration issues related to STL selection. Using C++ and CMake, the changes streamlined the build process and reduced manual intervention for contributors and customers targeting modern compilers. The update focused on forward-compatibility, enhancing the developer experience and aligning the project with evolving C++ standards.