Get it

rj is written in C++ and has no runtime dependencies¹. Building it should Just Work™ for most platforms, as long as there is a working C++17 compiler for it and it’s supported by mruby.

Binaries

As rj is still a work in progress there are no binaries for rj released yet.

From the time being you will need to build it yourself from source.

Build from source

You can download the sources here:

• Current version: v0.4.0 (.tar.gz, .zip)
• Development version (.tar.gz, .zip, git repository)

To build rj you first need to install the following build-time requirements:

• CMake 3.20 (or newer)
• Ruby 2.5 (or newer)
• a C++17 compiler (clang++ or g++ are fine)
• git

Once all build-time dependencies are installed you can go ahead and build it. The building process should be a matter of:

mkdir -p build && cd build
cmake ..
make

During the make step mruby is downloaded and built, there are no extra steps needed for that.

If you want to install rj on your system you can run sudo make install afterwards.

macOS

You can install CMake and Git from Homebrew. The C++17 compiler bundled with XCode (clang++) works fine; and macOS Monterey (12.4) ships with Ruby 2.6.8 which should be fine too (though I use a newer Ruby version using rbenv).

brew install cmake git

Linux

openSUSE

All dependencies are installable from the default repos via zypper:

sudo zypper in cmake gcc-c++ ruby git