This is a simple config utility for BLAS libraries, a la gcc-config. Please see bug 30453.
Created attachment 18823 [details] blas-config-1.0.0.ebuild
Created attachment 18824 [details] blas-config
Dependency is the other way around (on 30453) IIUC, corrected.
In portage, please test. The addition of all these packages should be coordinated, but they are large and requie testing. Thus rather than adding all in one go I will be adding them and masking in package.mask. This one is exception, as it is quite harmless on itself and is a dependency of all others. However for the other packages you will need to add them to /etc/portage/package.unmask in order to test them.. George