Comment 2 for bug 1524495

We have our own version of libunwind:
https://review.fuel-infra.org/gitweb?p=packages/centos7/libunwind.git;a=blob;f=libunwind.spec;h=0fed0f1c3d52338b9ffd48285666823fefd44407;hb=bba435916d0fb41240d1dbfc15c450bbee03ca0b

If we picked the one from EPEL, something went wrong during build stage. Please investigate, since it was working fine just yesterday with the same packages.