>>> Unpacking source...
>>> Unpacking WordNet-QueryData-1.47.tar.gz to /var/tmp/portage/perl-gcpan/WordNet-QueryData-1.47/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/perl-gcpan/WordNet-QueryData-1.47/work/WordNet-QueryData-1.47 ...
 * Using ExtUtils::MakeMaker
*** Please set the WNHOME environment variable to the location of your
***   WordNet installation.  QueryData.pm will not work otherwise.
*** Alternatively, you can make the installation in the default
***   location, C:\Program Files\WordNet\3.0 on Windows, or /usr/local/WordNet-3.0 on unix.
 * 
 * ERROR: perl-gcpan/WordNet-QueryData-1.47 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_compile
 *             environment, line 2384:  Called perl-module_src_compile
 *             environment, line 2109:  Called perl-module_src_prep
 *             environment, line 2162:  Called die
 * The specific snippet of code:
 *               echo "$pm_echovar" | perl Makefile.PL ${myconf} INSTALLMAN3DIR='none' PREFIX=/usr INSTALLDIRS=vendor DESTDIR=${D} || die "Unable to build! (are you using USE=\"build\"?)";
 *  The die message:
 *   Unable to build! (are you using USE="build"?)
 * 
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/perl-gcpan/WordNet-QueryData-1.47/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/perl-gcpan/WordNet-QueryData-1.47/temp/environment'.
 * This ebuild is from an overlay: '/usr/local/portage/overlays/private/'
 *