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# <a name="Building_GNUMach_GNU_Mach_from_S"> </a> Building [[GNUMach]] from Source
If you want to build the [[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.
## <a name="Getting_the_Source_Code"> Getting the Source Code </a>
### <a name="Developers_s_rcs"> Developers's rcs </a>
See [here](http://www.gnu.org/software/hurd/gnumach-download.html#cvs).
$ cvs -z3 -d:pserver:anonymous@cvs.savannah.gnu.org:/sources/hurd co -r gnumach-1-branch gnumach
(Most probably you want to get hold of the _GNU Mach 1 branch_ and not the trunk, which is also what we've done above.)
You then have to create the automatically generatable files:
$ ( cd gnumach && autoreconf --install )
### <a name="What_Debian_is_currently_using"> What Debian is currently using </a>
See [here](http://packages.debian.net/source/unstable/gnumach).
$ apt-get source gnumach
Please see [[Distrib/DebianFAQ]] before using _apt-get source_.
## <a name="Preparing_for_the_Build"> Preparing for the Build </a>
### <a name="_on_Debian_systems"> ... on Debian systems </a>
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
### <a name="_on_non_Debian_systems"> ... on non-Debian systems </a>
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 [[Mig/BuildingMIG]] 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.
## <a name="Building_and_Installing"> Building and Installing </a>
### <a name="_Debian_deb_files"> ... Debian _.deb_ files </a>
Change into the directory with the downloaded / unpacked _gnumach_ sources, e.g.
$ cd gnumach-20050801
Start the build process with
$ dpkg-buildpackage -us -uc -b -rfakeroot
[[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.
### <a name="_TODO_"> [TODO] </a>
GNU Mach should be built in a separate directory:
$ mkdir gnumach-build
$ cd gnumach-build
Find the path to your GNU Mach sources (_[...]/gnumach-1-branch_) and configure it:
$ [...]/gnumach-1-branch/configure [TODO]
Build the kernel image:
$ make gnumach.gz
Optionally run the (tiny) test suite:
$ make check
You can then install and use _gnumach.gz_.
[TODO.]
### <a name="Installing_only_the_Header_Files"> Installing only the Header Files </a>
GNU Mach should be built in a separate directory:
$ mkdir gnumach-build
$ cd gnumach-build
Find the path to your GNU Mach sources (_[...]/gnumach-1-branch_) and configure it:
$ [...]/gnumach-1-branch/configure --prefix=
Install the header files into e.g. _~/gnu/include/_:
$ make DESTDIR=~/gnu install-data
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