I can build a custom Linux Destktop distribution starting from open-source packages and load into it successfully, starting from the source code. Using a cross-compilation tool chain, I can build utilities/libraries into the Linux O.S as well (networking utilities, storage volume management software etc). Let me know if this is what you are looking for. I am a developer in C and Linux for the last 25 years, and have extensive knowledge of the tool chain and development environment and process in Linux. See my profile for details.