virtual/cblas-2.0 in the science overlay depends, among others, on sci-libs/openblas[incblas]. However, the lastest version of this package (updated today AFAIK) doesn't have anymore the incblas USE flag since it builds cblas library by default. This causes cblas to pull another cblas-providing lib, like gotoblas2 or atlas. Please remove the USE flag dependency to fix it. Reproducible: Always
+ 11 Aug 2013; Justin Lecher <jlec@gentoo.org> cblas-2.0.ebuild, metadata.xml: + Drop obsolete USE dep for openblas, #478130 +