The above constraints are a subset of the following complete expressio

I am unable to follow the examples I have web searched. Here is my error message/problem.:

Code:

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net-misc/curl-7.23.1::gentoo USE="ares gnutls ipv6 ldap nss ssl -idn -kerberos -ssh -static-libs -test -threads"

  The following REQUIRED_USE flag constraints are unsatisfied:
    nss? ( !gnutls )

  t The above constraints are a subset of the following complete expression:
  hreads? ( !ares ) nss? ( !gnutl

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One post said it meant I have to choose between gnutl or nss. Yet net-misc/curl seems to be asking for both gnutls and nss. I could not find out what the ! before a keyword meant. I am trying to follow this link:

http://forums.funtoo.org/viewtopic.php?id=994

Solved. I only needed to repeat what I had done for one package in /etc/portage/package.use and /etc/portage/package.mask

Code:

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x11-base/xorg-server udev
gnome-base/gnome-session branding
net-misc/networkmanager -nss gnutls dhclient -dhcpcd
net-misc/curl -nss gnutls ares
>=sys-apps/pciutils-3.1.8 -zlib
>=net-dns/avahi-0.6.30-r2 gtk3

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and Package.unmask

Code:

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>=net-misc/networkmanager-0.9.2.0-r1
>=net-misc/curl-7.23.1

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