1) I have installed atlas-lapack-base as blas/lapack for a number of 
packages already.
2) sagemath tries to install its own blas/lapack (openblas)
3) is there a way to configure sagemath to use this library instead? 
Otherwise I am in uninstall/reinstall hell.

pacman -S sagemath
resolving dependencies...
looking for conflicting packages...
:: openblas and atlas-lapack-base are in conflict (blas). Remove 
atlas-lapack-base? [y/N] y

:: removing atlas-lapack-base breaks dependency 'lapack' required by arpack
:: removing atlas-lapack-base breaks dependency 'lapack' required by 
coin-or-coinutils
:: removing atlas-lapack-base breaks dependency 'cblas' required by 
fflas-ffpack
:: removing atlas-lapack-base breaks dependency 'lapack' required by 
fflas-ffpack
:: removing atlas-lapack-base breaks dependency 'lapack' required by hugin
:: removing atlas-lapack-base breaks dependency 'cblas' required by iml
:: removing atlas-lapack-base breaks dependency 'lapack' required by libgiac
:: removing atlas-lapack-base breaks dependency 'cblas' required by opencv
:: removing atlas-lapack-base breaks dependency 'lapack' required by opencv
:: removing atlas-lapack-base breaks dependency 'cblas' required by 
python-numpy
:: removing atlas-lapack-base breaks dependency 'lapack' required by 
python-numpy
:: removing atlas-lapack-base breaks dependency 'cblas' required by 
python2-numpy
:: removing atlas-lapack-base breaks dependency 'lapack' required by 
python2-numpy
:: removing atlas-lapack-base breaks dependency 'lapack' required by 
qrupdate
:: removing atlas-lapack-base breaks dependency 'lapack' required by r
:: removing atlas-lapack-base breaks dependency 'lapack' required by 
sphinxbase
:: removing atlas-lapack-base breaks dependency 'lapack' required by 
suitesparse

and these requirements recurse to twice as many packages....

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