- get zlib 1.2.5 sources (dependency of libpng) from http://prdownloads.sourceforge.net/libpng/zlib-1.2.5.tar.gz?download
- extract zlib sources into zlib-1.2.5 dir
- get libpng 1.5.13 sources from http://sourceforge.net/projects/libpng/files/libpng15/older-releases/1.5.13/lpng1513.zip/download
- extract libpng sources beside the zlib-1.2.5 dir
- build the solution in libpng\projects\vstudio\vstudio.sln (static target ReleaseLibrary, DebugLibrary) with VS2013 (convert projects if asked).
