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Building Firefox 32-bit On Linux 64-bit
=======================================
.. note::
Unless you really want to target older hardware, you probably
want to :ref:`Build Firefox 64-bit <Building Firefox On Linux>`
since it is better-supported.
Before following these 32-bit-Firefox-specific instructions, follow
the :ref:`Building Firefox On Linux` instructions to ensure that
your machine can do a normal build.
Instructions for Ubuntu 19.10
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
These steps were verified to work as of June 2020.
#. Run ``rustup target install i686-unknown-linux-gnu`` to install the
32-bit Rust target.
#. Install 32-bit dependencies with the following command (this shouldn't try to
remove packages. If this is the case, those instructions won't work as-is):
.. code::
sudo apt install gcc-multilib g++-multilib \
libgtk2.0-dev:i386 libgtk-3-dev:i386 libpango1.0-dev:i386 libxt-dev:i386 \
libx11-xcb-dev:i386 libpulse-dev:i386 libdrm-dev:i386
#. Then, create a ``mozconfig`` file in your Firefox code directory
(probably ``mozilla-unified``) that looks like the following example:
.. code::
ac_add_options --target=i686
#. Run ``./mach build``.