-##### libpng #####
-website="http://www.libpng.org/pub/png/libpng.html"
-AC_CHECK_HEADERS([png.h],,
- [missing=yes
- echo "***** Missing libpng header ($website) *****"])
-AC_SEARCH_LIBS([png_sig_cmp], [png],,
- [missing=yes
- echo "***** Missing libpng ($website) *****"])
-
-##### libvorbis #####
-website="http://www.xiph.org/downloads/"
-AC_CHECK_HEADERS([vorbis/codec.h vorbis/vorbisfile.h],,
- [missing=yes
- echo "***** Missing vorbis headers ($website) *****"])
-AC_SEARCH_LIBS([ov_open], [vorbisfile],,
- [missing=yes
- echo "***** Missing libvorbisfile ($website) *****"])
-