>>> Emerging : portage://dev-libs/boost-1.90.0-r2:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ download  portage://dev-build/b2-5.5.3
             │           └─ file ─┤ 1.17 Mb  	 b2-5.5.3.tar.gz
             │ download  portage://dev-libs/boost-1.90.0-r2
             │           └─ file ─┤ 162.76 Mb  	 boost_1_90_0.tar.bz2

Total: 2 actions (2 downloads), grouped into 1 step.
       163.93 Mb to be downloaded.