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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'
RCS](https://git.savannah.gnu.org/git/hurd/):

    $ git clone https://git.savannah.gnu.org/git/hurd/mig.git/

... or (if you are working on a Debian system) get the sources that are used for the
[current Debian mig package](http://packages.debian.net/source/unstable/mig):

    $ apt source mig

The unpacked source tree is around 1 MiB, and the build tree also is around 1 MiB.

## <a name="_on_Debian_systems"> On Debian Systems: </a>

### <a name="Preparing_for_the_Build"> Preparing for the Build </a>

Building MIG requires the *build-essential* and *fakeroot* packages,
and some additional dependencies specified by the mig source package:

    # apt install build-essential fakeroot
    # apt build-dep mig

### <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:

    $ cd mig-X.X.X.XX

Start the build process:

    $ dpkg-buildpackage -us -uc -b -rfakeroot

Note: if you are building on a non-32bit system, you need to also pass e.g.
`--target-arch=i386` to build the 32bit version.

This will create a _.deb_ package in the parent directory,
which you can then install on your system.

## <a name="_on_non_Debian_systems"> On non-Debian Systems: </a>

### <a name="Preparing_for_the_Build"> Preparing for the Build </a>

Building the Mach Interface Generator requires a C compiler, a standard 32 bit
C library (with corresponding header files), your favourite flavor of awk
(gawk), yacc (bison), lex (flex) and make.

Additionally, you need to have GNU Mach's header files installed.  See
[[building GNU Mach|mach/gnumach/building]] about how to do that, then come back here.

### <a name="Building_and_Installing"> Building and Installing </a>

First, generate the configuration files:

    $ cd mig
    $ autoreconf --install

The Mach Interface Generator has to be built in a separate build directory:

    $ mkdir build
    $ cd build

Find the base directory where you installed GNU Mach's header files and where
you now intend to install the Mach Interface Generator (e.g. _~/gnu_), and run
configure:

    $ GNU=~/gnu
    $ TARGET_CPPFLAGS=-I"$GNU"/include ../configure --prefix="$GNU"

If you want to build 32-bit gnumach on a 64-bit machine, you need to add a --target option. mig(com) will be build as ELF64 binary, but it will generate 32-bit stub code for gnumach:

    $ GNU=~/gnu
    $ TARGET_CPPFLAGS=-I"$GNU"/include ../configure --prefix="$GNU" --target=i686-gnu TARGET_CC=i686-linux-gnu-gcc

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/