distcc client and multiarch cross-compiling distcc server for Slackware
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Here you will find the following SlackBuilds that will build packages to set up a Slackware-based distcc "build farm":

  • distcc-masq-client (distcc & ccache 'masquerade mode' client)

  • distcc-masq-server (distcc 'masquerade mode' server)

  • arm-x-toolchain (gcc and g++ cross compiler for Slackware ARM)

  • gcc-legacy (old versions of gcc/g++/objc)


This package sets up a 'masquerade mode' distcc client for gcc (including g++ and objc) and clang/clang++.

This package also integrates full support for ccache (including ccache without distcc), although ccache is not enabled by default (see below).

Configuring distcc

After installing distcc-masq-client, please configure it by editing the file /etc/distcc/hosts -- you should change '' to the distcc host specification for your servers. This file sets the system-wide default.

Or you can configure distcc for a particular user by setting the DISTCC_HOSTS environment variable in the user's profile, for example

export DISTCC_HOSTS="bigserver/4 tinyserver"

For details of the format of /etc/distcc/hosts and the DISTCC_HOSTS environment variable, see 'man distcc', section 'HOST SPECIFICATIONS'.

Configuring ccache

ccache is not enabled by default. It can consume large amounts of storage, and one-off compilation (e.g. successfully building a package from SlackBuilds.org) is typically 15% slower. You will only benefit from enabling ccache if you compile the same source multiple times.

  • To enable ccache permanently, please edit the ccache system config file /etc/ccache.conf -- change the line 'disable = true' to 'disable = false'.

  • To use ccache without distcc, please enable ccache as above, and then disable distcc by editing the file /etc/distcc/hosts -- please delete the line that contains ''.

For alternative ways of configuring ccache options, please see 'man ccache', section 'CONFIGURATION'.

Disabling and enabling distcc and ccache

To disable distcc temporarily, you can unset the DISTCC_HOSTS environment variable. (This is a change to the upstream behaviour, which would apply the system-wide defaults if DISTCC_HOSTS is unset.)


To enable distcc temporarily, you can set the DISTCC_HOSTS environment variable.

export DISTCC_HOSTS='myserver,lzo'

To disable ccache temporarily, you can set the CCACHE_DISABLE environment variable.

export CCACHE_DISABLE=true

To enable ccache temporarily, you can set the CCACHE_NODISABLE environment variable.



This package sets up a 'masquerade mode' distcc server for gcc (including g++ and objc) and clang/clang++.

If the server and the clients have different versions of Slackware installed, you will also need the 'gcc-legacy' package (see below).

To start the distccd daemon automatically on boot, you must add these lines in /etc/rc.d/rc.local:

if [ -x /etc/rc.d/rc.distccd ]; then
  /etc/rc.d/rc.distccd start

You must also edit the file /etc/distcc/clients.allow to add your networks and/or hosts that will be allowed to use the server, for example,

Cross compilation

On x86_64, the server supports full multiarch cross compilation -- it can build for x86_64, for i486/i586/i686, and for arm if the arm-x-toolchain package is installed:

  • To compile for Slackware 64 (x86_64) clients, and to cross-compile for 32 bit Slackware clients (i486 etc), you don't need to do anything. Slackware's x86_64 gcc and llvm packages already support i486/i586/i686 cross-compilation.

  • To cross-compile for Slackware ARM clients, you need to install the arm-x-toolchain package on the server.

On i486/i586/i686, the server supports i486/i586/i686 clients, and also arm clients if the arm-x-toolchain package is installed.

On arm, the server supports arm clients. Cross compilation is not supported.

server client support
x86_64 x86_64 yes
x86_64 i?86 yes
x86_64 arm requires arm-x-toolchain
i?86 x86_64 no
i?86 i?86 yes
i?86 arm requires arm-x-toolchain
arm x86_64 no
arm i?86 no
arm arm yes


This is Stuart Winter's x-toolchain (from the Slackware ARM devtools), packaged to work with distcc-masq-client and distcc-masq-server. It is intended to be installed on a distcc server, and called from a Slackware ARM client using masquerade mode. The distcc server should be running either Slackware64 (x86_64) or Slackware (i486/i586/i686).

If your client system is running Slackware ARM 14.2, you should install arm-x-toolchain version 14.2 on your distcc server. This is the default.

If your client system is running Slackware ARM 14.1, you should install arm-x-toolchain version 14.1 on your distcc server. Your client system should be fully patched -- that is, it should have been updated with the packages gcc-4.8.4-arm-1_slack14.1 and gcc-g++-4.8.4-arm-1_slack14.1.

If your client system is running Slackware ARM -current, you will need to rebuild and reinstall arm-x-toolchain on your distcc server whenever your client system's gcc packages are updated. You must use rsync to download the latest version of x-toolchain to the SlackBuild's directory:

rsync -Pva --delete \
  rsync://rsync.slackware.org.uk/slackwarearm/slackwarearm-devtools/x-toolchain/ \

In this case, the SlackBuild will build a package with a version number of 'current_yyyymmdd'.


This SlackBuild repackages old versions of the gcc compilers from previous versions of Slackware. It is intended to be installed on a distcc server, for use by distcc clients running other versions of Slackware. With this package installed, the distcc server will be able to build using the same version of gcc/g++ as the client.

The gcc-legacy package does not conflict with Slackware's own gcc packages. clang/clang++ legacy versions are not supported.

By default, the SlackBuild will repackage gcc from Slackware 14.1 and 14.0. To specify which Slackware versions should be repackaged, specify the VERSION environment variable when running the SlackBuild. If your distcc server is running Slackware-current, you can use VERSION="14.2". Multiple Slackware versions should be separated by '+', for example

VERSION="14.1+14.0" ./gcc-legacy.SlackBuild


  • For security reasons you should only use distcc on networks that you trust.
  • These SlackBuilds do not support distcc 'pump mode'.
  • Slackware's distcc does not support ipv6, zeroconf or GSS-API.

Compilation failures

When a compilation fails for any reason, distcc will always apply a "backoff period" of 60 seconds. During this time, all compilations will be run on the client, and the following message will be displayed:

distcc[pid] (dcc_build_somewhere) Warning: failed to distribute, running locally instead

This is normal behaviour. Many packages use ./configure scripts or cmake feature tests that rely on compilation failures to discover information about the build environment, and therefore distcc may show the above message for up to a minute. However, if the message persists, there may be a problem, and you can check the log file (/var/log/distccd).

A few packages simply will not build with distcc. These SlackBuilds.org packages are known to fail: gdal, urbanlightscape, klibc, mpv, fwbuilder, virtualbox


For a full description of 'masquerade mode', see 'man distcc', section 'MASQUERADING'.

Slackware ARM's x-toolchain can be found at ftp://ftp.arm.slackware.com/slackwarearm/slackwarearm-devtools/x-toolchain/

distcc development is now on Github at https://github.com/distcc

ccache development is at https://ccache.samba.org/