=> Bootstrap dependency digest>=20010302: found digest-20121220
=> Bootstrap dependency fetch-[0-9]*: found fetch-1.8nb1
=> Checksum SHA1 OK for optipng-0.7.4.tar.gz
=> Checksum RMD160 OK for optipng-0.7.4.tar.gz
===> Installing dependencies for optipng-0.7.4nb1
=> Tool dependency nbpatch-[0-9]*: found nbpatch-20100124
=> Tool dependency checkperms>=1.1: found checkperms-1.11
=> Full dependency zlib>=1.2.3: found zlib-1.2.7
=> Full dependency png>=1.6.0nb1: found png-1.6.2
===> Overriding tools for optipng-0.7.4nb1
===> Extracting for optipng-0.7.4nb1
===> Patching for optipng-0.7.4nb1
=> Applying pkgsrc patches for optipng-0.7.4nb1
=> Verifying /usr/pkgsrc/graphics/optipng/patches/patch-src_optipng_osys.c
=> Applying pkgsrc patch /usr/pkgsrc/graphics/optipng/patches/patch-src_optipng_osys.c
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|$NetBSD: patch-src_optipng_osys.c,v 1.1 2013/01/11 13:27:53 joerg Exp $
|
|--- src/optipng/osys.c.orig	2013-01-11 01:14:19.000000000 +0000
|+++ src/optipng/osys.c
--------------------------
Patching file src/optipng/osys.c using Plan A...
Hunk #1 succeeded at 514.
done
===> Creating toolchain wrappers for optipng-0.7.4nb1
===> Configuring for optipng-0.7.4nb1
=> Checking for portability problems in extracted files
Checking for gcc...
Checking for system libpng...
Checking for system zlib...