Crazy `multiple definition` error at link time

gistfile1.txt

g++ -pthread -shared build/temp.linux-x86_64-2.7/Quaternions/Quaternions.o build/temp.linux-x86_64-2.7/Quaternions/IntegrateAngularVelocity.o build/temp.linux-x86_64-2.7/Quaternions/Utilities.o build/temp.linux-x86_64-2.7/PostNewtonian/C++/PNEvolution.o build/temp.linux-x86_64-2.7/PostNewtonian/C++/PNEvolution_Q.o build/temp.linux-x86_64-2.7/PostNewtonian/C++/PNWaveformModes.o build/temp.linux-x86_64-2.7/SphericalFunctions/Combinatorics.o build/temp.linux-x86_64-2.7/SphericalFunctions/WignerDMatrices.o build/temp.linux-x86_64-2.7/SphericalFunctions/SWSHs.o build/temp.linux-x86_64-2.7/SpacetimeAlgebra/SpacetimeAlgebra.o build/temp.linux-x86_64-2.7/Utilities.o build/temp.linux-x86_64-2.7/Waveforms.o build/temp.linux-x86_64-2.7/PNWaveforms.o build/temp.linux-x86_64-2.7/Scri.o build/temp.linux-x86_64-2.7/SWIG/GWFrames_wrap.o -Lspinsfast/lib -L/usr/local/gsl/1.16/lib -L/usr/local/fftw3-3.2.2/lib -lgsl -lgslcblas -lfftw3 -lspinsfast -o build/lib.linux-x86_64-2.7/_GWFrames.so -fPIC
build/temp.linux-x86_64-2.7/Waveforms.o: In function `~vector':
GWFrames/Code/Waveforms.cpp:4978: multiple definition of `SpacetimeAlgebra::I3'
build/temp.linux-x86_64-2.7/SpacetimeAlgebra/SpacetimeAlgebra.o:/usr/include/pthread.h:1112: first defined here
build/temp.linux-x86_64-2.7/Waveforms.o: In function `~vector':
GWFrames/Code/Waveforms.cpp:4978: multiple definition of `SpacetimeAlgebra::psI'
build/temp.linux-x86_64-2.7/SpacetimeAlgebra/SpacetimeAlgebra.o:/usr/include/pthread.h:1112: first defined here
build/temp.linux-x86_64-2.7/Waveforms.o: In function `~vector':
GWFrames/Code/Waveforms.cpp:4978: multiple definition of `SpacetimeAlgebra::gamma_3'
build/temp.linux-x86_64-2.7/SpacetimeAlgebra/SpacetimeAlgebra.o:/usr/include/pthread.h:1112: first defined here
build/temp.linux-x86_64-2.7/Waveforms.o: In function `std::_Vector_base<double, std::allocator<double> >::_M_deallocate(double*, unsigned long)':
/usr/local/gcc-4.6.1/lib/gcc/x86_64-unknown-linux-gnu/4.6.1/../../../../include/c++/4.6.1/bits/stl_vector.h:155: multiple definition of `SpacetimeAlgebra::gamma_2'
build/temp.linux-x86_64-2.7/SpacetimeAlgebra/SpacetimeAlgebra.o:GWFrames/Code/SpacetimeAlgebra/SpacetimeAlgebra.cpp:85: first defined here
build/temp.linux-x86_64-2.7/Waveforms.o: In function `std::_Vector_base<double, std::allocator<double> >::_M_deallocate(double*, unsigned long)':
/usr/local/gcc-4.6.1/lib/gcc/x86_64-unknown-linux-gnu/4.6.1/../../../../include/c++/4.6.1/bits/stl_vector.h:155: multiple definition of `SpacetimeAlgebra::gamma_1'
build/temp.linux-x86_64-2.7/SpacetimeAlgebra/SpacetimeAlgebra.o:GWFrames/Code/SpacetimeAlgebra/SpacetimeAlgebra.cpp:85: first defined here
build/temp.linux-x86_64-2.7/Waveforms.o: In function `std::_Vector_base<double, std::allocator<double> >::_M_deallocate(double*, unsigned long)':
/usr/local/gcc-4.6.1/lib/gcc/x86_64-unknown-linux-gnu/4.6.1/../../../../include/c++/4.6.1/bits/stl_vector.h:155: multiple definition of `SpacetimeAlgebra::gamma_0'
build/temp.linux-x86_64-2.7/SpacetimeAlgebra/SpacetimeAlgebra.o:GWFrames/Code/SpacetimeAlgebra/SpacetimeAlgebra.cpp:85: first defined here
collect2: ld returned 1 exit status
error: command 'g++' failed with exit status 1