05-28-2016
Well if you really want to "tweak the guts of the O/S" I guess you need to start from source code; is that what you mean?
There are a number of Linux distros that allow you to download the whole source code and then compile if you've got CPU cycles to burn and a few hours to do it in. I know that Ubuntu will allow that. Also Gentoo provides kernel tailoring letting you build the O/S you want.
Understanding all this can be an issue if you haven't done it before. There's a project called Linux From Scratch (LFS) which provides source code but also a book in both digital and hardcopy which describes the internals of how the kernel is built. That might be a good place to start.
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LEARN ABOUT MINIX
config.guess
CONFIG.GUESS(1) User Commands CONFIG.GUESS(1)
NAME
config.guess - guess the build system triplet
SYNOPSIS
config.guess [OPTION]
DESCRIPTION
The GNU build system distinguishes three types of machines, the `build' machine on which the compilers are run, the `host' machine on which
the package being built will run, and, exclusively when you build a compiler, assembler etc., the `target' machine, for which the compiler
being built will produce code.
This script will guess the type of the `build' machine.
Output the configuration name of the system `config.guess' is run on.
Operation modes:
-h, --help
print this help, then exit
-t, --time-stamp
print date of last modification, then exit
-v, --version
print version number, then exit
ENVIRONMENT VARIABLES
config.guess might need to compile and run C code, hence it needs a compiler for the `build' machine: use the environment variable
`CC_FOR_BUILD' to specify the compiler for the build machine. If `CC_FOR_BUILD' is not specified, `CC' will be used. Be sure to specify
`CC_FOR_BUILD' is `CC' is a cross-compiler to the `host' machine.
CC_FOR_BUILD a native C compiler, defaults to `cc'
CC a native C compiler, the previous variable is preferred
REPORTING BUGS
Report bugs and patches to <config-patches@gnu.org>.
Originally written by Per Bothner.
Copyright 1992-2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
autoconf(1), automake(1), autoreconf(1), autoupdate(1), autoheader(1), autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1).
GNU Autoconf 2.69 August 2017 CONFIG.GUESS(1)