>>> Emerging : portage://dev-cpp/prometheus-cpp-1.2.4:run?{[]}

These are the packages that would be merged, in order:

Calculating dependencies... done!

 └─step  1─┤ useflag portage://www-servers/civetweb-1.16 (cxx)

 └─step  2─┤ download  portage://dev-cpp/prometheus-cpp-1.2.4
             │           └─ file ─┤ 72.22 Kb  	 prometheus-cpp-1.2.4.tar.gz
             │ download  portage://www-servers/civetweb-1.16
             │           └─ file ─┤ 11.53 Mb  	 civetweb-1.16.tar.gz

Total: 3 actions (1 useflag, 2 downloads), grouped into 2 steps.
       11.61 Mb to be downloaded.


>>> Assumptions taken during proving & planning:

  USE flag change (1 package):
  Add to /etc/portage/package.use:
    www-servers/civetweb cxx