I've implemented the GLFW basic example.
The GLFW header file is reported as not being found and such the CLion IDE is reporting and error and not providing intellisense however the project correctly compiles and runs.
I've added the GLFW library as per the guidance in their documentation (See CMakeLists.txt).
The project is being built and run remotely on Ubuntu 20.04.
/* Initialize the library */
find_package(glfw3 3.3 REQUIRED)