Add libpng and zlib to the inputs.
* gnu/packages/freetype.scm: Rename file to... * gnu/packages/fontutils.scm: ...this. * Makefile.am (MODULES): Rename module. * gnu/packages/{ghostscript,grub,pdf,texlive}.scm: Rename dependency.
* gnu/packages/pdf.scm: New file. * Makefile.am (MODULES): Add it.