• cpptoml: https://github.com/skystrife/cpptoml
• fips: https://github.com/floooh/fips/

Requires C++ exceptions enabled, add the following line to you toplevel CMakeLists.txt file before fips_setup() is called, or build with a fips config that sets FIPS_EXCEPTIONS to ON:

set(FIPS_EXCEPTIONS ON CACHE BOOL "Enable C++ exceptions" FORCE)
fips_setup()
...

This is a header-only lib, simply add to your fips.yml as import and include cpptoml.h:

imports:
    fips-cpptoml:
        git:    https://github.com/floooh/fips-cpptoml