Generally, for what you are doing, the warning messages can be ignored. It is that last error that is hanging you up, and I don't think I can be much help with that.
I was just looking at the tcl foundary site on sourceforge, and I noticed that tcl/tk is at version 8.4.9 now. It looks to me like you are compiling version 8.3.5. You might want to get the source for 8.4.9 and try compiling that. (you would need the same version tcl.) Another option, if you just want to get tcl/tk on your machine and don't need to compile in any special settings, would be to look for a rpm for tcl/tk on the Fedora Core site and install that. Tcl/tk is so popular though, it would surprise me if it weren't on your install disks and you could install it from there. I am not sure what version came with Fedora Core 2 though.