I recently found some problems compiling Perl::Tk 804.028 on AIX 5.3 - all concerning the libpng : mainly use of variable jmpbuf conflict with AIX use of same name (actually AIX #define 's jmpbuf to __jmpbuf), and also miscellaneous other compilation errors, and also failure to build libpng.a (not clear if intentional or not - PNG/README says "If you don't already have libpng then you can install it from there, but this process is not automated." but I don't see why it should not be) I don't know if these are known or not (don't see how to search in this subforum) - anyway I fixed all these for my environment and if you wish I can attach my patch file (where?) John