cave resolve mutt -x
Done: 216 steps

These are the actions I will take, in order:

n   dev-libs/libassuan:0::arbor 2.0.2 to ::installed
    "Standalone IPC library used by gpg, gpgme and newpg"
    build_options: symbols=split jobs=2 recommended_tests -trace -preserve_work
    Reasons: app-crypt/gnupg, app-crypt/gpgme
n   dev-libs/libksba:0::arbor 1.2.0 to ::installed
    "Makes X.509 certificates and CMS easily accessible to applications"
    build_options: symbols=split jobs=2 recommended_tests -trace -preserve_work
    Reasons: app-crypt/gnupg
n   app-crypt/pinentry:0::arbor 0.8.1-r1 to ::installed
    "Collection of simple PIN or passphrase entry dialogs which utilize"
    -gtk -qt4 build_options: symbols=split jobs=2 recommended_tests -trace -preserve_work
    Reasons: app-crypt/gnupg (rec)
n   dev-libs/pth:0::arbor 2.0.7 to ::installed
    "GNU Portable Threads"
    build_options: symbols=split jobs=2 recommended_tests -trace -preserve_work
    Reasons: app-crypt/gnupg, app-crypt/gpgme
n   net-libs/cyrus-sasl:0::arbor 2.1.24-rc1 to ::installed
    "Library implementing the Simple Authentication and Security Layer"
    ssl build_options: symbols=split jobs=2 recommended_tests -trace -preserve_work
    Reasons: mail-client/mutt
n   app-crypt/gnupg:0::arbor 2.0.18 to ::installed
    "The GNU Privacy Guard, a GPL pgp replacement"
    -doc -smartcard build_options: symbols=split jobs=2 recommended_tests -trace -preserve_work
    Reasons: app-crypt/gpgme
n   app-crypt/gpgme:0::arbor 1.3.1 to ::installed
    "A library for making GPG easier to use"
    build_options: symbols=split jobs=2 recommended_tests -trace -preserve_work
    Reasons: mail-client/mutt
n   mail-client/mutt:0::arbor 1.5.21 to ::installed
    "A text-based email client"
    -gdbm gpgme idn sasl -tokyocabinet build_options: symbols=split jobs=2 recommended_tests -trace -preserve_work
    Reasons: target

Total: 8 new installs

Build Options:
    jobs:                          How many jobs the package's build system should use, where supported
    preserve_work:                 Do not remove build directories, and do not modify the image when merging
    recommended_tests:             Run tests considered by the package to be recommended
    symbols:                       How to handle debug symbols in installed files
    trace:                         Trace actions executed by the package (very noisy, for debugging broken builds only)

OPTIONS:
    doc:                           Adds extra documentation (API, Javadoc, etc)
    gdbm:                          use gdbm for header caching
    gpgme:                         Enable support for gpgme
    gtk:                           Adds support for x11-libs/gtk+ (The GIMP Toolkit)
    idn:                           Enable support for Internationalized Domain Names
    qt4:                           Adds support for the Qt GUI/Application Toolkit version 4.x
    sasl:                          Adds support for the Simple Authentication and Security Layer
    smartcard:                     Install the smartcard daemon ( includes CCID support ).
    ssl:                           Adds support for Secure Socket Layer connections
    tokyocabinet:                  use tokyocabinet for header caching

I encountered the following ignorable errors for untaken packages:

(!) net-www/elinks
    Reasons: mail-client/mutt (sug): "Provides a text based browser for viewing HTML-formatted mail"

Executing pretend actions: 8 of 8
 * The following option requirements are unmet for mail-client/mutt-1.5.21:
 *     Exactly one of options ( gdbm, tokyocabinet ) must be met