Break up `Mach' and `Mig' hierarchies, merge them into `microkernel/mach/', `microkernel/mach/gnumach/', `microkernel/mach/mig/', and elsewhere.

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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 [[building_MIG|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.
+
+## <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