=> Bootstrap dependency digest>=20010302: found digest-20111104
=> Bootstrap dependency fetch-[0-9]*: found fetch-1.7
=> Checksum SHA1 OK for optipng-0.6.5.tar.gz
=> Checksum RMD160 OK for optipng-0.6.5.tar.gz
===> Installing dependencies for optipng-0.6.5
=> Build dependency checkperms>=1.1: found checkperms-1.11
=> Full dependency zlib>=1.2.3: found zlib-1.2.3
===> Overriding tools for optipng-0.6.5
===> Extracting for optipng-0.6.5
===> Patching for optipng-0.6.5
===> Creating toolchain wrappers for optipng-0.6.5
===> Configuring for optipng-0.6.5
=> Checking for portability problems in extracted files
Checking for system zlib...
Using pre-configured libpng...