OK, I found the problem! When trying to compile 8.9 I got a more explicit error message (which I since then "lost" by compiling again) when it also failed due to openblas.
The problem was using export MAKE="make -j4 -l5.5" as suggested in the README.md file. The `-l5.5` parameter was the problem. Removing it, I could compile 9.0 and now am compiling 8.9. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/e6b5f656-541d-4242-84f4-8432c5a47de6%40googlegroups.com.