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

Calculating dependencies ... done!
Dependency resolution took 0.91 s (backtrack: 0/20).


The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by net-misc/gns3-server-2.2.56::gentoo
# required by =net-misc/gns3-server-2.2.56 (argument)
>=sys-apps/busybox-1.36.1-r4 static

!!! The ebuild selected to satisfy "sys-apps/busybox[static]" has unmet requirements.
- sys-apps/busybox-1.36.1-r4::gentoo USE="pam -debug -livecd -make-symlinks -math -mdev -savedconfig (-selinux) -sep-usr -static -syslog"

  The following REQUIRED_USE flag constraints are unsatisfied:
    pam? ( !static )

(dependency required by "net-misc/gns3-server-2.2.56::gentoo[-test]" [ebuild])
(dependency required by "=net-misc/gns3-server-2.2.56" [argument])