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Here are the basic steps to build Erlang/OTP in the Git repository.
Start by cloning:

git clone git://github.com/erlang/otp.git

Next, set ERL_TOP the environment variable:

cd otp
export ERL_TOP=`pwd`

The repository does not contain a generated configure file, so it must be generated like this:

./otp_build autoconf

before configure can be run. When the configure files has been generated, you can build in the usual way as described in the README file. Shortly:

./configure
make

To run the system you have built without installing it first:

$ERL_TOP/bin/erl