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# Building [[GNU_Mach|gnumach]] from Source
If you want to build the [[GNU_Mach|gnumach]] kernel yourself instead of just using a
pre-built binary, follow these instructions.
The unpacked source tree is around 20 MiB, and the build tree (with all drivers
enabled) is around 50 MiB.
## Getting the Source Code
### Developers's RCS
See <http://savannah.gnu.org/git/?group=hurd>.
$ git clone git.savannah.gnu.org:/srv/git/hurd/gnumach.git
### What Debian is currently using
See [here](http://packages.debian.net/source/unstable/gnumach).
$ apt-get source gnumach
Please see the Debian [[running/debian/FAQ]] before using `apt-get source`.
## On Debian Systems:
### Preparing for the Build
Building GNU Mach requires the *build-essential* and *fakeroot* packages, their
dependencies and additional packages that are specified by the source gnumach
package:
# apt-get install build-essential fakeroot
# apt-get build-dep gnumach
### Building and Installing ... Debian `.deb` files
Change into the directory with the downloaded / unpacked GNU Mach sources, e.g.
$ cd gnumach-20050801
Start the build process with
$ dpkg-buildpackage -us -uc -b -rfakeroot
[[GNU_Mach|gnumach]] is now building. To use the new kernel, you must install the
resulting `.deb` package which is located one directory above the build
directory and has a similar name as the build directory, e.g.
# dpkg -i ../gnumach_20050801-4_hurd-i386.deb
You can now reboot your computer and enjoy the new kernel.
## On non-Debian Systems:
### Preparing for the Build
Apart from the case that you only want to install GNU Mach's header files (see
below), building GNU Mach requires you to have the Mach Interface Generator
installed. See [[building_MIG|mig/gnu_mig/building]] about how to do that, then come
back here.
Additionally, building GNU Mach requires a C compiler, a standard C library and
your favourite flavor of awk (gawk) and GNU make.
### Preparation:
You first have to create the automatically generatable files:
$ cd gnumach
$ autoreconf --install
### Installing only the Header Files
GNU Mach and its headers should be built in separate directories:
$ cd ..
$ mkdir gnumach-build-h
$ cd gnumach-build-h
Find the path to your GNU Mach sources (`../gnumach`) and configure
it (the --host flag is needed for 64 bit systems):
$ ../gnumach/configure --prefix= --host=i686-unknown-linux-gnu
Install the header files into e.g. `~/gnu/include/`:
$ make DESTDIR=~/gnu install-data
### Building and Installing
GNU Mach should be built in a separate directory:
$ cd ..
$ mkdir gnumach-build
$ cd gnumach-build
Find the path to your GNU Mach sources (`../gnumach`) and configure
it:
$ ../gnumach/configure
If you are building on a 64 bit system, do the following instead:
$ CPP='gcc -m32 -E -x c -undef -ansi' CC='gcc -m32' LD='ld -melf_i386'
$ ../gnumach/configure --host=i686-unknown-linux-gnu
Build the kernel image:
$ make gnumach.gz
Optionally run the (tiny) test suite:
$ make check
You can then install and use `gnumach.gz`.
[TODO.]
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