There is a libunwind issue with gcc 3.4 and glibc. Basically, libunwind causes gcc to generate incompatible libgcc_s.so.1: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14925 There are 2 problems: 1. Functions in libunwind aren't versioned. 2. How easy/hard to move a versioned definition from one DSO to another? Any suggestions? H.J.