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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
You can either use the git repository (see <http://savannah.gnu.org/git/?group=hurd>),
$ git clone git.savannah.gnu.org:/srv/git/hurd/gnumach.git
... or Debian sources, if you're using Debian. (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-XXXXXXXX
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_XXXXXXXX-X_hurd-i386.deb
You can now reboot your computer and enjoy the new kernel.
## On non-Debian Systems:
### Preparing for the Build
Building GNU Mach requires a C compiler, a static 32 bit standard C library and
your favourite flavor of awk (gawk) and GNU make.
### Installing only the Header Files
First, you have to create the configuartion files:
$ cd gnumach
$ autoreconf --install
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:
$ ../gnumach/configure --prefix=
Instead, use the --host flag on 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
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.
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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