Bug#902589: Cause of undefined references

[André Offringa]

After looking a bit closer I found that my liblapack.so is a symlink to 
libopenblas, as libopenblas is set as the 'alternative' for providing 
lapack. It appears that libopenblas does not implement the "2sage" 
methods, while liblapacke requires them. After setting the lapack lib as 
alternative for liblapack.so (by removing libopenblas-base), everything 
works. I'm not sure this is a bug in libopenblas (by not providing those 
new functions) or in liblapacke (by requiring those functions) but 
currently they won't work together.