Thanks for the quick reply.

I thought that was the problem, but when I looked at the GSL library docs, it says they no longer link to gslcblas, leaving it to the application programmer to link the CBLAS library of their choice. I checked the indi cmake filea and there is no mention of a CBLAS with any recognizable name. The libgsl has a 106 undefined symbols, all of them beginning with "cblas_".

Perhaps there is an older version that includes cblas.