Hi all, Some clarification about this issue. This was caused by gcc update. Since version 4.5 a completely new type of symbols was introduced - unique global symbol (GNU-UNIQUE). This means that older version of linker and gcc will not support such symbols. _ZNSs4_Rep20_S_empty_rep_storageE is one of those symbols, which means you can't run it on older systems. And glibc23 is working fine because it was build with older toolchain, without such symbols.