Package libpng-devel

Development tools for programs to manipulate PNG image format files

http://www.libpng.org/pub/png/

The libpng-devel package contains header files and documentation necessary
for developing programs using the PNG (Portable Network Graphics) library.

If you want to develop programs which will manipulate PNG image format
files, you should install libpng-devel. You'll also need to install
the libpng package.

Library Functions (Section 3)
libpng
The libpng library supports encoding, decoding, and various manipulations of the Portable Network Graphics (PNG) format image files. It uses the zlib(3)...
libpngpf
The functions previously listed here are used privately by libpng and are not available for use by applications. They are not "exported" to applications using...