gistfile1.txt

$ emerge -av rrdtool
[ebuild   R   ] net-analyzer/rrdtool-1.5.3-r1  USE="graph tcpd -dbi -doc -lua -perl -python -rados -rrdcgi -ruby -static-libs -tcl" PYTHON_TARGETS="-python2_7*"

<snip>

 * Messages for package net-analyzer/rrdtool-1.5.3-r1:

 * No Python implementation selected for the build. Please set
 * the PYTHON_TARGETS variable in your make.conf to include one
 * of the following values:
 * 
 * python2_7
 * ERROR: net-analyzer/rrdtool-1.5.3-r1::gentoo failed (setup phase):
 *   No supported Python implementation in PYTHON_SINGLE_TARGET/PYTHON_TARGETS.
 * 
 * Call stack:
 *                 ebuild.sh, line  93:  Called pkg_setup
 *                 ebuild.sh, line 321:  Called python-single-r1_pkg_setup
 *   python-single-r1.eclass, line 464:  Called python_setup
 *   python-single-r1.eclass, line 454:  Called die
 * The specific snippet of code:
 *   		die "No supported Python implementation in PYTHON_SINGLE_TARGET/PYTHON_TARGETS."
 * 
 * If you need support, post the output of `emerge --info '=net-analyzer/rrdtool-1.5.3-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=net-analyzer/rrdtool-1.5.3-r1::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/net-analyzer/rrdtool-1.5.3-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-analyzer/rrdtool-1.5.3-r1/temp/die.env'.
 * Working directory: '/var/tmp/portage/._portage_reinstall_.0k4DbN/pym'
 * S: '/var/tmp/portage/net-analyzer/rrdtool-1.5.3-r1/work/rrdtool-1.5.3'