machi/doc/dev-prerequisites.md

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## Machi developer environment prerequisites
1. Machi requires an 64-bit variant of UNIX: OS X, FreeBSD, Linux, or
Solaris machine is a standard developer environment for C and C++
applications (64-bit versions).
2. You'll need the `git` source management utility.
3. You'll need the 64-bit Erlang/OTP 17 runtime environment. Please
don't use earlier or later versions until we have a chance to fix
the compilation warnings that versions R16B and 18 will trigger.
Also, please verify that you are not using a 32-bit Erlang/OTP
runtime package.
For `git` and the Erlang runtime, please use your OS-specific
package manager to install these. If your package manager doesn't
have 64-bit Erlang/OTP version 17 available, then we recommend using the
[precompiled packages available at Erlang Solutions](https://www.erlang-solutions.com/resources/download.html).
Also, please verify that you have enough file descriptors available to
your user processes. The output of `ulimit -n` should report at least
4,000 file descriptors available. If your limit is lower (a frequent
problem for OS X users), please increase it to at least 4,000.