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Pull request Compare This branch is 8344 commits behind erlang:master.
Latest commit 50f396e Oct 27, 2014 Marcus Arendt Merge branch 'maint'
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HOWTO Fix some spelling misstakes Aug 4, 2014
bin The R13B03 release. Nov 20, 2009
bootstrap Update primary bootstrap Oct 3, 2014
erts Merge branch 'sverk/hipe-inline-reserve-trap-frame' Oct 24, 2014
lib Merge branch 'maint' Oct 27, 2014
make Merge branch 'lukas/ose/master-17.0/OTP-11334' Mar 27, 2014
plt The R13B03 release. Nov 20, 2009
system Merge branch 'maint' Sep 4, 2014
xcomp Merge branch 'lukas/ose/master-17.0/OTP-11334' Mar 27, 2014
.gitattributes Stop including in .gitignore files in the source tar files Aug 18, 2010
.gitignore ct: .gitignore ct_property_test.xml Oct 8, 2014
.mailmap Add .mailmap file Feb 14, 2010
AUTHORS The R13B03 release. Nov 20, 2009
EPLICENCE The R13B03 release. Nov 20, 2009 Silence an echo in Apr 15, 2014
OTP_VERSION Development versions Apr 10, 2014 Correct and clean up documentation Apr 2, 2014
TAR.include Move README and INSTALL to HOWTO folder Jul 19, 2012
aclocal.m4 erts: Fix various autoconf issues May 9, 2014 Add configure option --with-ssl-incl=PATH Sep 10, 2014 OTP-8323 Cross compilation improvements and other build system Feb 8, 2010
otp_build Replace 'otp_build patch_app' with 'otp_patch_apply' Mar 31, 2014
otp_versions.table Updated OTP version Oct 23, 2014
prebuild.delete Regenerate bootstrap/{erl,erlc} when switching target Aug 9, 2010
prebuild.skip OTP-8323 Cross compilation improvements and other build system Feb 3, 2010


Erlang is a programming language used to build massively scalable soft real-time systems with requirements on high availability. Some of its uses are in telecom, banking, e-commerce, computer telephony and instant messaging. Erlang's runtime system has built-in support for concurrency, distribution and fault tolerance.

OTP is set of Erlang libraries and design principles providing middle-ware to develop these systems. It includes its own distributed database, applications to interface towards other languages, debugging and release handling tools.


BEAM is the name of the virtual machine where all Erlang code is executed. Every compiled Erlang file has the suffix .beam. The virtual machine is sometimes referred to as the emulator.

ERTS is the Erlang Runtime System where the BEAM, kernel and standard libraries amongst others are included.

More information can be found at

Building and Installing

Information on building and installing Erlang/OTP can be found in the $ERL_TOP/HOWTO/ document.

Contributing to Erlang/OTP

Here are the instructions for submitting patches.

In short:

  • We prefer to receive proposed updates via email on the erlang-patches mailing list or through a pull request.

  • Pull requests will be handled once everyday and there will be essential testing before we will take a decision on the outcome of the request. If the essential testings fails, the pull request will be closed and you will have to fix the problem and submit another pull request when this is done.

  • We merge all proposed updates to the pu (proposed updates) branch, typically within one working day.

  • At least once a day, the contents of the pu branch will be built on several platforms (Linux, Solaris, Mac OS X, Windows, and so on) and automatic test suites will be run. We will email you if any problems are found.

  • If a proposed change builds and passes the tests, it will be reviewed by one or more members of the Erlang/OTP team at Ericsson. The reviewer may suggest improvements that are needed before the change can be accepted and merged.

  • Once or twice a week, a status email called "What's cooking in Erlang/OTP" will be sent to the erlang-patches mailing list.

Copyright and License


Copyright Ericsson AB 2010-2014. All Rights Reserved.

The contents of this file are subject to the Erlang Public License, Version 1.1, (the "License"); you may not use this file except in compliance with the License. You should have received a copy of the Erlang Public License along with this software. If not, it can be retrieved online at

Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License.