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# <a name="Building_the_Mach_Interface_Gene"> Building the Mach Interface Generator from Source </a>
If you want to build the Mach Interface Generator yourself instead of just using a pre-built package, follow these instructions.
## <a name="Getting_the_Source_Code"> Getting the Source Code </a>
You can chose between getting the [sources from the developers's rcs](http://www.gnu.org/software/hurd/mig-download.html#cvs):
$ cvs -z3 -d:pserver:anonymous@cvs.savannah.gnu.org:/sources/hurd co mig
... or (if you are working on a Debian system) the ones that are used for the [current Debian mig package](http://packages.debian.net/source/unstable/mig):
$ apt-get source mig
Please see [[Distrib/DebianFAQ]] before using _apt-get source_.
The unpacked source tree is around 1 MiB, and the build tree also is around 1 MiB.
## <a name="Preparing_for_the_Build"> Preparing for the Build </a>
### <a name="_on_Debian_systems"> ... on Debian systems </a>
Building the Mach Interface Generator requires the _build-essential_ and _fakeroot_ packages, their dependencies and additional packages that are specified by the source mig package:
# apt-get install build-essential fakeroot
# apt-get build-dep mig
### <a name="_on_non_Debian_systems"> ... on non-Debian systems </a>
Building the Mach Interface Generator requires a C compiler, a standard C library (with corresponding header files) and your favourite flavor of awk (gawk), yacc (bison), lex (flex) and make.
Additionally, you need to have GNU Mach's header files installed. See [[mach/gnumach/building]] about how to do that, then come back here.
## <a name="Building_and_Installing"> Building and Installing </a>
### <a name="_a_deb_file"> ... a _.deb_ file </a>
Change into the directory with the downloaded / unpacked MIG sources (_mig-1.3.1.99_):
$ cd mig-1.3.1.99
Start the build process:
$ dpkg-buildpackage -us -uc -b -rfakeroot
You can then install / distribute the _.deb_ file which will drop out one directory above the current one.
### <a name="_TODO_"> [TODO] </a>
The Mach Interface Generator has to be built in a separate directory:
$ mkdir mig-build
$ cd mig-build
Find the root directory where you installed GNU Mach's header files and where you now intend to install the Mach Interface Generator (_~/gnu_) and the path to your Mach Interface Generator sources (\_[...]/mig) and configure it:
$ GNU=~/gnu
$ TARGET_CPPFLAGS=-I"$GNU"/include [...]/mig/configure --prefix="$GNU"
Build and install the Mach Interface Generator into _$GNU_, i.e. _~/gnu/_ in our example:
$ make all install
To make your _mig_ binary easily available, you should append something like the following to e.g. your _~/.bash\_profile_:
PATH=~/gnu/bin:$PATH
export PATH
If you already have e.g. _~/bin_ in your _$PATH_, you could also create a symbolic link:
$ ln -s ~/gnu/bin/mig ~/bin/
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