>>> Emerging : portage://dev-util/google-perftools-2.16:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ download  portage://dev-util/google-perftools-2.16
             │           └─ file ─┤ 1.66 Mb  	 gperftools-2.16.tar.gz

 └─step  2─┤ downgrade portage://dev-util/google-perftools-2.16 (replaces pkg://dev-util/google-perftools-2.17.2)
             │           └─ conf ─┤ USE = "debug -llvm-libunwind -minimal -optimisememory -pagesize-128k -pagesize-16k -pagesize-256k -pagesize-32k
             │                    │          -pagesize-64k -static-libs -test"
             │                    │ SLOT = "0/4"

 └─step  3─┤ run     portage://dev-util/google-perftools-2.16

Total: 3 actions (1 download, 1 downgrade, 1 run), grouped into 3 steps.
       1.66 Mb to be downloaded.