Worked on the Esri/harfbuzz repository to improve build stability in the Windows DirectWrite font rendering path. Addressed a missing-prototypes error by guarding the hb_directwrite_font_get_dw_font prototype with HB_DISABLE_DEPRECATED in both header and source files, ensuring deprecated APIs did not cause build failures. This C++ development effort enhanced code hygiene and reduced the risk of future breakage from deprecated interfaces. The fix contributed to more reliable continuous integration workflows and regression-free builds for Windows environments. Focused on build system management and C++ language features, the work supported downstream font rendering pipelines by improving the robustness of the DirectWrite integration.