>>> Unpacking source...
>>> Unpacking boost_1_34_1.tar.bz2 to /var/tmp/portage/dev-libs/boost-1.34.1-r2/work
>>> Unpacking boost-patches-1.34.1-3.tbz2 to /var/tmp/portage/dev-libs/boost-1.34.1-r2/work
 * Applying various patches (bugfixes/updates) ...
 *   05_all_1.34.1-function.patch ...
  [ ok ]
 *   06_all_1.34.1-gcc43_regex-include.patch ...
  [ ok ]
 *   07_all_1.34.1-CVE-2008-0171_and_0172.patch ...
  [ ok ]
 * Done with patching
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/dev-libs/boost-1.34.1-r2/work/boost_1_34_1 ...
 * Writing new user-config.jam
 * Using the following options to build: 
 *   release debug-symbols=none optimization=none --user-config=/var/tmp/portage/dev-libs/boost-1.34.1-r2/work/boost_1_34_1/user-config.jam
 * Building static libraries
Building Boost.Regex with the optional Unicode/ICU support disabled.
Please refer to the Boost.Regex documentation for more information
(don't panic: this is a strictly optional feature).
notice: could not find main target  4.0
notice: assuming it's a name of file to create 
don't know how to make <e>4.0
...found 1 target...
...can't find 1 target...
 * 
 * ERROR: dev-libs/boost-1.34.1-r2 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_compile
 *             environment, line 3114:  Called die
 * The specific snippet of code:
 *           bjam ${NUMJOBS} -q ${OPTIONS} threading=single,multi runtime-link=${linkoption} link=${linkoption} --prefix="${D}/usr" --layout=system || die "building boost failed";
 *  The die message:
 *   building boost failed
 * 
 * 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/dev-libs/boost-1.34.1-r2/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-libs/boost-1.34.1-r2/temp/environment'.
 *