OK, thanks, I guess it's fine as long as the default is OpenBLAS.
BTW, it would be very useful to build with USE_BLAS64=1 OPENBLAS_SYMBOLSUFFIX=64_ to use an ILP64 BLAS. Without this, packages using BinaryBuilder/BinaryProvider which call BLAS won't install. This affects notably Arpack.jl, which is a dependency of several very common packages. (I'm currently working on this for Fedora.)
