Hi John, Today we had the opportunity to try out the fix that you were so kind to share with us. It works like a charm !!!!! One thing we did notice though is the "perl Makefile.PL" command after applying your patch file generates the following messages: perl Makefile.PL . . . Checking for mmap support... Yes. Finding dependencies for PNG.xs Finding dependencies for imgPNG.c Missing ')' trailing: L) && defined(PNG_MAX_MALLOC_64K) at /work/server-build/CGI/Tk-804.028/Tk/MakeDepend.pm line 104, <libpng/pngconf.h> line 1423. Writing Makefile for Tk::PNG Did you encounter a similar message? Thanks a lot for your help. Much appreciated. Regards, Phil pliu@ci.com