I noticed this line in your log:
ar: /home/kjs/Software/sage/local/var/tmp/sage/build/gcc-4.9.3.p1/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /usr/bin/../bin/../lib/bfd-plugins/LLVMgold.so) I've run into this myself in a different scenario. Most probably, the libstdc++ you're building as part of gcc-4.9.3 is older than the one against which your system is linked. By the looks of it, you end up running a utility (perhaps ar?) that uses your system LLVMgold (probably because it's a utility that's part of your system), but the loader ends up using the newly built libstdc++, which doesn't provide a new enough version. I expect that your best shot is to use the system gcc rather than build one yourself. I think gcc versions that cause problems with sage are relatively rare outside OSX. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
