Installing lapack for numpy

Question

Running Ubuntu 11.10 + python2.7...built numpy from source and installed it, but when I go to install it, I get

ImportError: /usr/lib/liblapack.so.3gf: undefined symbol: ATL_chemv 

when it tries to import lapack_lite from numpy.linalg. I tried to rebuild lapack from scratch, but it seems to just make

/usr/local/lib/libblas.a /usr/local/lib/liblapack.a /usr/local/lib/libtmglib.a 

and the .so file. Where does the .so.3gf come from, and how do I fix it?

Answer 1

I was having the same problem and removing the package libopenblas-base did the trick:

sudo apt-get remove libopenblas-base 

As already explained by others, several packages provide incompatible versions of liblapack.so.3gf.

Answer 2

According to some bugreports I see around, you may have more than one provider of BLAS/ATLAS/LAPACK installed, like ATLAS and OpenBLAS/GotoBLAS, that conflict with each other. Have a look on this:

$ ls -l /etc/alternatives/*.so.3gf 

and check that all them correspond to the same package (eg. they all point into /usr/lib/atlas-base/)