ziproxy-2.7.2-libpng14.patch contains a diff to file "configure.in" and a diff to file "ziproxy-2.7.2/src/image.c". epatch fails to apply it because those files are at different levels. Changing "configure.in" to be "ziproxy-2.7.2/configure.in" works for me. Reproducible: Always
*** Bug 313183 has been marked as a duplicate of this bug. ***
Thanks for reporting, fixed in tree now.