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

Calculating dependencies ... done!
Dependency resolution took 1.11 s (backtrack: 0/20).

[ebuild  N     ] acct-group/ipsec-0-r2::gentoo  0 KiB
[ebuild  N     ] virtual/linux-sources-3-r9::gentoo  USE="-firmware" 0 KiB
[ebuild  N     ] acct-user/ipsec-0-r2::gentoo  0 KiB
[ebuild  N     ] net-vpn/strongswan-6.0.4-r1::gentoo  USE="caps constraints gmp non-root openssl pam pkcs11 sqlite strongswan_plugins_aes strongswan_plugins_cmac strongswan_plugins_curve25519 strongswan_plugins_des strongswan_plugins_dnskey strongswan_plugins_drbg strongswan_plugins_eap-radius strongswan_plugins_fips-prf strongswan_plugins_gcm strongswan_plugins_hmac strongswan_plugins_led strongswan_plugins_lookip strongswan_plugins_md5 strongswan_plugins_nonce strongswan_plugins_pem strongswan_plugins_pgp strongswan_plugins_pkcs1 strongswan_plugins_pkcs7 strongswan_plugins_pkcs8 strongswan_plugins_pkcs12 strongswan_plugins_pubkey strongswan_plugins_random strongswan_plugins_rc2 strongswan_plugins_revocation strongswan_plugins_sha1 strongswan_plugins_sha2 strongswan_plugins_sshkey strongswan_plugins_stroke strongswan_plugins_systime-fix strongswan_plugins_unity strongswan_plugins_vici strongswan_plugins_x509 strongswan_plugins_xcbc -curl -debug -dhcp -eap -farp -gcrypt -ldap -mysql -networkmanager (-selinux) -strongswan_plugins_acert -strongswan_plugins_addrblock -strongswan_plugins_aesni -strongswan_plugins_af-alg -strongswan_plugins_agent -strongswan_plugins_blowfish -strongswan_plugins_botan -strongswan_plugins_bypass-lan -strongswan_plugins_ccm -strongswan_plugins_chapoly -strongswan_plugins_connmark -strongswan_plugins_ctr -strongswan_plugins_error-notify -strongswan_plugins_files -strongswan_plugins_forecast -strongswan_plugins_ha -strongswan_plugins_ipseckey -strongswan_plugins_kdf -strongswan_plugins_md4 -strongswan_plugins_mgf1 -strongswan_plugins_openxpki (-strongswan_plugins_padlock) -strongswan_plugins_rdrand -strongswan_plugins_save-keys -strongswan_plugins_sha3 -strongswan_plugins_soup -strongswan_plugins_test-vectors -strongswan_plugins_unbound -strongswan_plugins_whitelist -strongswan_plugins_xauth-noauth (-systemd) -verify-sig" 4801 KiB

Total: 4 packages (4 new), Size of downloads: 4801 KiB