How to generate project files for a project? Could not find a package configuration file provided by "packageName" with any of the following names error

Usage
1

I’m trying to generate project files for bencode project. It uses fmt, gsl and expected libraries as dependencies, it adds them using

find_package(fmt CONFIG REQUIRED)
find_package(gsl-lite CONFIG REQUIRED)
find_package(expected-lite CONFIG REQUIRED)

When I run cmake CMakeLists.txt, I get an error:

-- Selecting Windows SDK version 10.0.18362.0 to target Windows 10.0.19045.
CMake Error at CMakeLists.txt:30 (find_package):
  Could not find a package configuration file provided by "fmt" with any of
  the following names:

    fmtConfig.cmake
    fmt-config.cmake

  Add the installation prefix of "fmt" to CMAKE_PREFIX_PATH or set "fmt_DIR"
  to a directory containing one of the above files.  If "fmt" provides a
  separate development package or SDK, be sure it has been installed.

The fmt library doesn’t provide neither fmtConfig.cmake, nor fmt-config.cmake file in its’ repository. So even after I manually clone the fmt repository locally, there is no directory to provide with the files.

2

You’ll need to build fmt (and the other projects) to generate files for find_package. I would recommend also installing them somewhere rather than using their build trees.