To fix it, I simply "touched" the file that did not exist. Then the procedure completed without error. I think the script simply needs a line to touch the file if it does not exist.

In your case it looks like the file to touch is /usr/local/src/redhat/BUILD/gtk-gnutella-0.93u/po/gtk-gnutella.po

In other words, issue the command "touch /usr/local/src/redhat/BUILD/gtk-gnutella-0.93u/po/gtk-gnutella.po" (just in case you don't know what touch means.