не могу собрать rrdtool-1.3.8

При сборке net-analyzer/rrdtool-1.3.8 с флагами:
net-analyzer/rrdtool-1.3.8 USE="nls perl python -doc -rrdcgi -ruby -tcl"
выскакивает:

* Messages for package net-analyzer/rrdtool-1.3.8:

 * ERROR: net-analyzer/rrdtool-1.3.8 failed:
 *   econf failed
 *
 * Call stack:
 *     ebuild.sh, line   54:  Called src_configure
 *   environment, line 2983:  Called econf '--disable-rrdcgi' '--enable-nls' '--enable-libintl' '--disable-ruby' '--disable-ruby-site-install' '--enable-perl' '--enable-perl-site-install' '--disable-tcl' '--without-tcllib' '--enable-python'
 *     ebuild.sh, line  544:  Called die
 * The specific snippet of code:
 *                      die "econf failed"
 *
 * If you need support, post the output of 'emerge --info =net-analyzer/rrdtool-1.3.8',
 * the complete build log and the output of 'emerge -pqv =net-analyzer/rrdtool-1.3.8'.
 * The complete build log is located at '/var/tmp/portage/net-analyzer/rrdtool-1.3.8/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-analyzer/rrdtool-1.3.8/temp/environment'.
 * S: '/var/tmp/portage/net-analyzer/rrdtool-1.3.8/work/rrdtool-1.3.8'

webstream vhosts.d # eselect python list
Available Python interpreters:
  [1]   python2.6 *
  [2]   python3.1

как это победить?