if(UNIX AND NOT APPLE)
  if(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
    set(FREEBSD TRUE)
  else()
    set(LINUX TRUE)
  endif()
elseif(UNIX AND APPLE)
  set(MACOS TRUE)
endif()

if (LINUX)
  find_file(ALPINE_FOUND alpine-release PATHS /etc)
endif()