Description of problem:

When building uhd-3.5.3-1.fc20 on Power, the sph_recv_test never completes (and then the build task times out and is killed by koji): 

Running tests...
/usr/bin/ctest --force-new-ctest-process 
Test project /builddir/build/BUILD/uhd-release_003_005_003/host/build
      Start  1: addr_test
 1/15 Test  #1: addr_test ........................   Passed    0.03 sec
      Start  2: buffer_test
 2/15 Test  #2: buffer_test ......................   Passed    0.03 sec
      Start  3: byteswap_test
 3/15 Test  #3: byteswap_test ....................   Passed    0.02 sec
      Start  4: convert_test
 4/15 Test  #4: convert_test .....................   Passed    0.52 sec
      Start  5: dict_test
 5/15 Test  #5: dict_test ........................   Passed    0.02 sec
      Start  6: error_test
 6/15 Test  #6: error_test .......................   Passed    0.01 sec
      Start  7: gain_group_test
 7/15 Test  #7: gain_group_test ..................   Passed    0.01 sec
      Start  8: msg_test
 8/15 Test  #8: msg_test .........................   Passed    0.01 sec
      Start  9: property_test
 9/15 Test  #9: property_test ....................   Passed    0.02 sec
      Start 10: ranges_test
10/15 Test #10: ranges_test ......................   Passed    0.02 sec
      Start 11: sph_recv_test
EXCEPTION: Timeout(172800) expired for command:
 # ['bash', '--login', '-c', 'rpmbuild -bb --target ppc --nodeps builddir/build/SPECS/uhd.spec']

Full build log: http://ppc.koji.fedoraproject.org/kojifiles/work/tasks/2801/1352801/build.log