>>>>> "TalGloz" == TalGloz <glozmantal@xxxxxxxxx> writes: TalGloz> Which is good, my seal_mean_cxx_v2.so being created and copied TalGloz> to /usr/pgsql-12/lib/. But right after that I get this and it TalGloz> doesn't seem to effect my seal_mean_cxx_v2.so library: What's happening here is that it's attempting to build LLVM bitcode files for your library for the benefit of the JIT compiler that exists in recent postgres versions - without these files, your extension functions cannot be inlined into generated code. This requires that your code be compilable using clang (as well as gcc if that's what was used to build PG itself), and there's clearly some disagreement going on between clang and your system header files that's causing the failure. I didn't see an easy way of disabling bitcode emission for a module, though I think that has been discussed before. -- Andrew (irc:RhodiumToad)