proto is an utility library that I use in my own graphics-related projects.
It contains basic infrastructure to do small vector linear algebra, and some simple ray-tracing constructs.
Since this project is a header-only library, it can be added to your project simply by writing the following CMake code to your CMakeLists.txt:
add_subdirectory(/path/to/proto)
This line will provide the target proto::proto, which you can link against.
Alternatively, if you have several projects that depend on proto, you can use a call to
find_package(proto):
find_package(proto REQUIRED)
This will require to set the CMake variable proto_DIR. For that, you can alternatively
use the build directory, or install the library somewhere, say /path/to/install, and
set proto_DIR to the path /path/to/install/lib/cmake.