fixed_known_bad_version

 Boost version: 1.52.0
-- Found the following Boost libraries:
--   filesystem
--   system
--   unit_test_framework
--   program_options
-- WARNING: Found a known bad version of Boost (v105200). Disabling.
CMake Error at volk/CMakeLists.txt:79 (message):
  VOLK Requires boost to build
1)
vi /etc/portage/package.mask
#Temporary mask for GNU Radio
<=dev-libs/boost-1.52.0-r6
=============================

2)
emerge -C dev-libs/boost && emerge dev-libs/boost && emerge net-wireless/gnuradio

==============================

make sure you stop by http://gnuradio.org/doc/doxygen/build_guide.html
and check if you have all the dependencies
doxygen pyqt4 etc.