LibreOffice/core — reverse-engineered prompt

Please get this LibreOffice core project working from source on my machine. I want to be able to open the main office suite, create and save a text document, a spreadsheet, and a presentation, and verify that common document files open without crashing.

Please inspect the repo, follow the official LibreOffice build instructions for my operating system, install or tell me the missing tools, configure the build in the normal recommended way, and run a basic build and smoke test. If the full build is too heavy, make the smallest practical developer build that launches and explain what is still missing.

Keep changes minimal and do not rewrite the app. If you hit platform specific setup issues, look up the current LibreOffice docs online and use them. At the end, leave me with the exact commands to rebuild, run, and clean everything.