The file isn't a Perl script, it's basically a unified diff that is commonly fed into the patch program (originally written by Larry Wall) to apply the patches automatically. Typically, the filename is included in the diff output, so in this case I don't think patch can handle this format, but this patch is simple enough: it's telling you to insert the line "log4perl.appender.Logfile.mode = clobber" after the line "log4perl.appender.Logfile.layout = Log::Log4perl::Layout::SimpleLayout" (as indicated at the top, look at line number 448), and we can infer from the context in this thread that it's referring to t/026FileApp.t in the Log::Log4perl distro.
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