I had the same problem as you. Under OSX overriding the library instead of replacing the library in the R.framework solved the problem for me: $ DYLD_FORCE_FLAT_NAMESPACE=y DYLD_INSERT_LIBRARIES=/Developer/NVIDIA/CUDA-7.0/lib/libnvblas.7.0.dylib R ...
For those who are also struggling with building NumPy with OpenBLAS, the _dotblas module is no longer available since NumPy 1.10.0, according to the Release Notes. Found from this post.
In include dir there is openblas_config.h You can find openblas version there. i.e. grep OPENBLAS_VERSION /usr/local/include/openblas_config.h ...
c++,visual-studio-2010,armadillo,glpk,openblas
libopenblas.dll was the cause of the problem - for some reason linking in VS2010 caused errors. I am not sure why, but linking against the lapack libraries in the Armadillo distribution (pre v4) fixed the issue.
numpy,ubuntu-14.04,blas,openblas
Based on the ldd output, NumPy must already be linked with OpenBLAS. It just doesn't know it, because it's linked via /usr/lib/libblas*, which it sees as generic BLAS.