OBNC is a compiler for Niklaus Wirth’s programming language Oberon. It implements the latest version of the language from 2016. OBNC translates source code written in Oberon to the lower-level programming language C. The translated code is then compiled and linked with the C compiler and linker of the host operating system. The build command obnc performs all these tasks and keeps track of which files need to be compiled or recompiled.