The sursprise comes when you try to compile the minimal book version and find out that it is not as lean as presented in the book but actually depends on hundereds of assembler files (see https://github.com/rochus-keller/Minix3/tree/Minix3_Book_TCC).
alt Hacker News
The book version is a subset of Minix version 3.1.0 (see https://github.com/rochus-keller/Minix3/tree/3.1.0).
The sursprise comes when you try to compile the minimal book version and find out that it is not as lean as presented in the book but actually depends on hundereds of assembler files (see https://github.com/rochus-keller/Minix3/tree/Minix3_Book_TCC).