someone can help me with kiwix

how i can install this
http://www.calculate-linux.org/packages/app-text/kiwix

im noob in gentoo

calculate jt # emerge kiwix

Calculating dependencies... done!
[ebuild  N     ] dev-libs/xapian-1.2.5 
[ebuild  N    ~] net-libs/libmicrohttpd-0.9.12  USE="ssl -messages -test" 
[ebuild  N     ] app-text/asciidoc-8.5.3  USE="-examples -graphviz -vim-syntax" 
[ebuild  N    ~] net-misc/aria2-1.12.1  USE="bash-completion bittorrent nls ssl -ares -expat -gnutls -metalink -scripts -sqlite -test -xmlrpc" 
[ebuild  N    ~] app-text/kiwix-0.9_beta2 

The following keyword changes are necessary to proceed:
#required by app-text/kiwix-0.9_beta2, required by kiwix (argument)
>=net-misc/aria2-1.12.1 ~x86
#required by app-text/kiwix-0.9_beta2, required by kiwix (argument)
>=net-libs/libmicrohttpd-0.9.12 ~x86
#required by kiwix (argument)
>=app-text/kiwix-0.9_beta2 ~x86

NOTE: This --autounmask behavior can be disabled by setting
      EMERGE_DEFAULT_OPTS="--autounmask=n" in make.conf.

Kiwix is masked. You can unmask the package yourself, or use utilities Portage.

1. Create a file with any name in the directory /etc/portage/package.keywords/ with the following contents:

#required by app-text/kiwix-0.9_beta2, required by kiwix (argument)
>=net-misc/aria2-1.12.1 ~x86
#required by app-text/kiwix-0.9_beta2, required by kiwix (argument)
>=net-libs/libmicrohttpd-0.9.12 ~x86
#required by kiwix (argument)
>=app-text/kiwix-0.9_beta2 ~x86

2. Make sure that the /etc/portage/package.keywords/ directory there is at least one file. If not, create. For example:

touch /etc/portage/package.keywords/my

Then let the package manager to unmask the packages:

emerge --autounmask=y --autounmask-write kiwix

Update settings:

dispatch-conf

Press “u” to make changes.

other problem.

* Messages for package app-text/kiwix-0.9_beta2:

 * ERROR: app-text/kiwix-0.9_beta2 failed (configure phase):
 *   econf failed
 * 
 * Call stack:
 *          ebuild.sh, line   91:  Called src_configure
 *        environment, line 2683:  Called _eapi2_src_configure
 *   phase-helpers.sh, line  556:  Called econf
 *   phase-helpers.sh, line  454:  Called die
 * The specific snippet of code:
 *              die "econf failed"
 * 
 * If you need support, post the output of 'emerge --info =app-text/kiwix-0.9_beta2',
 * the complete build log and the output of 'emerge -pqv =app-text/kiwix-0.9_beta2'.
 * The complete build log is located at '/var/calculate/tmp/portage/app-text/kiwix-0.9_beta2/temp/build.log'.
 * The ebuild environment file is located at '/var/calculate/tmp/portage/app-text/kiwix-0.9_beta2/temp/environment'.
 * S: '/var/calculate/tmp/portage/app-text/kiwix-0.9_beta2/work/kiwix-0.9'

 * Regenerating GNU info directory index...
 * Processed 148 info files.

I also failed to compile. Write to the Gentoo maintainer bugs.gentoo.org and they will correct the error. Or wait until the release of the package.