Building a Linux Kernel

Preparing the Build Environment

Before a single line of code can turn into a working kernel, the host machine must host the right tools and libraries. On Debian‑based systems, a single command pulls in most of what you need: sudo apt-get install build-essential libncurses5-dev libssl-dev bison flex libelf-dev. The build-essential package brings the GNU compiler, assembler, and linker. libncurses5-dev powers the text‑based configuration screens that follow. The SSL library provides support for signed packages and secure downloads. Bison and Flex generate parsers that the kernel build system uses internally. libelf-dev supplies functions to read and write ELF object files, which the kernel uses to produce its final image.