Remove links to old build instructions.

docs/old_linux_build_instructions.md

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-# Linux-specific build instructions
-
-## Common checkout instructions
-
-This page covers Linux-specific setup and configuration. The
-[general checkout
-instructions](http://dev.chromium.org/developers/how-tos/get-the-code) cover
-installing depot tools and checking out the code via git.
-
-## Overview
-
-Due its complexity, Chromium uses a set of custom tools to check out and build
-rather than configure/make like most projects. You _must_ use gclient and
-ninja, and there is no "install" step provided.
-
-### System requirements
-
-*   **64-bits**: x86 builds are not supported on Linux.
-*   **Memory**: >16GB is highly recommended.
-*   **Disk space**: Expect a full checkout and build to take nearly 100GB.
-*   **Distribution**: You should be able to build Chromium on any reasonably modern Linux
-    distribution, but there are a lot of distributions and we sometimes break
-    things on one or another. Internally, our development platform has been a
-    variant of Ubuntu 14.04 (Trusty Tahr); we expect you will have the most
-    luck on this platform.
-
-## Software setup
-
-Non-Ubuntu distributions are not officially supported for building and the
-instructions below might be outdated.
-
-### Ubuntu
-
-Once you have checked out the code, run
-[build/install-build-deps.sh](/build/install-build-deps.sh) The script only
-supports current releases as listed on https://wiki.ubuntu.com/Releases.
-This script is used to set up the canonical builders, and as such is the most
-up to date reference for the required prerequisites.
-
-### Debian
-
-Follow the Ubuntu instructions above. If you want to install the build-deps
-manually, note that the original packages are for Ubuntu. Here are the Debian
-equivalents:
-
-*   libexpat-dev -> libexpat1-dev
-*   freetype-dev -> libfreetype6-dev
-*   libbzip2-dev -> libbz2-dev
-*   libcupsys2-dev -> libcups2-dev
-
-Additionally, if you're building Chromium components for Android, you'll need to
-install the package: lib32z1
-
-### openSUSE
-
-For openSUSE 11.0 and later, see
-[Linux openSUSE Build Instructions](linux_open_suse_build_instructions.md).
-
-### Fedora
-
-Recent systems:
-
-    su -c 'yum install git python bzip2 tar pkgconfig atk-devel alsa-lib-devel \
-    bison binutils brlapi-devel bluez-libs-devel bzip2-devel cairo-devel \
-    cups-devel dbus-devel dbus-glib-devel expat-devel fontconfig-devel \
-    freetype-devel gcc-c++ GConf2-devel glib2-devel glibc.i686 gperf \
-    glib2-devel gtk2-devel gtk3-devel java-1.*.0-openjdk-devel libatomic \
-    libcap-devel libffi-devel libgcc.i686 libgnome-keyring-devel libjpeg-devel \
-    libstdc++.i686 libX11-devel libXScrnSaver-devel libXtst-devel \
-    libxkbcommon-x11-devel ncurses-compat-libs nspr-devel nss-devel pam-devel \
-    pango-devel pciutils-devel pulseaudio-libs-devel zlib.i686 httpd mod_ssl \
-    php php-cli python-psutil wdiff'
-
-The msttcorefonts packages can be obtained by following the instructions
-present [here](http://www.fedorafaq.org/#installfonts). For the optional
-packages:
-
-*   php-cgi is provided by the php-cli package
-*   sun-java6-fonts doesn't exist in Fedora repositories, needs investigating
-
-### Arch Linux
-
-Most of these packages are probably already installed since they're often used,
-and the parameter --needed ensures that packages up to date are not reinstalled.
-
-    sudo pacman -S --needed python perl gcc gcc-libs bison flex gperf pkgconfig \
-    nss alsa-lib gconf glib2 gtk2 nspr ttf-ms-fonts freetype2 cairo dbus \
-    libgnome-keyring
-
-For the optional packages on Arch Linux:
-
-*   php-cgi is provided with pacman
-*   wdiff is not in the main repository but dwdiff is. You can get wdiff in
-    AUR/yaourt
-*   sun-java6-fonts do not seem to be in main repository or AUR.
-
-### Mandriva
-
-    urpmi lib64fontconfig-devel lib64alsa2-devel lib64dbus-1-devel \
-    lib64GConf2-devel lib64freetype6-devel lib64atk1.0-devel lib64gtk+2.0_0-devel \
-    lib64pango1.0-devel lib64cairo-devel lib64nss-devel lib64nspr-devel g++ python \
-    perl bison flex subversion gperf
-
-*   msttcorefonts are not available, you will need to build your own (see
-instructions, not hard to do, see
-[mandriva_msttcorefonts.md](mandriva_msttcorefonts.md)) or use drakfont to
-import the fonts from a windows installation
-*  These packages are for 64 bit, to download the 32 bit packages,
-substitute lib64 with lib
-*  Some of these packages might not be explicitly necessary as they come as
-   dependencies, there is no harm in including them however.
-
-### Gentoo
-
-    emerge www-client/chromium
-
-## Troubleshooting
-
-### Linker Crashes
-
-If, during the final link stage:
-
-    LINK out/Debug/chrome
-
-You get an error like:
-
-    collect2: ld terminated with signal 6 Aborted terminate called after throwing an
-    instance of 'std::bad_alloc'
-
-    collect2: ld terminated with signal 11 [Segmentation fault], core dumped
-
-you are probably running out of memory when linking. You *must* use a 64-bit
-system to build. Try the following build settings (see [GN build
-configuration](https://www.chromium.org/developers/gn-build-configuration) for
-setting):
-
-*   Build in release mode (debugging symbols require more memory).
-    `is_debug = false`
-*   Turn off symbols. `symbol_level = 0`
-*   Build in component mode (this is for developers only, it will be slower and
-    may have broken functionality). `is_component_build = true`
-
-## More links
-
-*   [Faster builds on Linux](linux_faster_builds.md)
-*   Information about [building with Clang](clang.md).
-*   You may want to
-    [use a chroot](using_a_linux_chroot.md) to
-    isolate yourself from versioning or packaging conflicts (or to run the
-    layout tests).
-*   Cross-compiling for ARM? See [LinuxChromiumArm](linux_chromium_arm.md).
-*   Want to use Eclipse as your IDE? See
-    [LinuxEclipseDev](linux_eclipse_dev.md).
-*   Built version as Default Browser? See
-    [LinuxDevBuildAsDefaultBrowser](linux_dev_build_as_default_browser.md).
-
-## Next Steps
-
-If you want to contribute to the effort toward a Chromium-based browser for
-Linux, please check out the [Linux Development page](linux_development.md) for
-more information.