C3 has precompiled binaries for Windows, MacOS and Ubuntu. For other platforms it should be possible to compile it on any platform LLVM can compile to. You will need CMake installed.
1. Install LLVM
See LLVM the LLVM documentation on how to set up LLVM for development. On MacOS, installing through Homebrew works fine. Using apt-get on Linux should work fine as well. For Windows you can download suitable pre-compiled LLVM binaries from https://github.com/c3lang/win-llvm
2. Clone the C3 compiler source code from Github
This should be as simple as doing:
git clone https://github.com/c3lang/c3c.git
... from the command line.
3. Build the compiler
Create the build directory:
MyMachine:c3c$ mkdir build MyMachine:c3c$ cd build/
Use CMake to set up:
MyMachine:c3c/build$ cmake ../
Build the compiler:
4. Test it out
MyMachine:c3c/build$ ./c3c compile-run ../resources/testfragments/helloworld.c3