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

Calculating dependencies ... done!
Dependency resolution took 1.05 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/xmlrpc-c-1.64.03-r1:0/4.59::gentoo  USE="abyss cgi curl cxx libxml2 -static-libs -test" 916 KiB
[ebuild  N     ] net-analyzer/flowgrind-0.8.2::gentoo  USE="-doc -gsl -pcap" 259 KiB

Total: 2 packages (2 new), Size of downloads: 1175 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by net-analyzer/flowgrind-0.8.2::gentoo
# required by =net-analyzer/flowgrind-0.8.2 (argument)
>=dev-libs/xmlrpc-c-1.64.03-r1 abyss