[vdr] compile problem cannot find -lpng

[Joerg Riechardt <J.Riechardt@gmx.de>]

I get following error message trying to compile vdr1.0.4-AIO22.06 with
teletext
what is wrong?

g++ -g -O2 config.o dvbapi.o dvbosd.o eit.o font.o i18n.o interface.o
menu.o osd.o recording.o remote.o remux.o ringbuffer.o svdrp.o thread.o
tools.o vdr.o videodir.o sockets.o spu.o ca52.o dts.o lcd.o teletext.o
-la52 -ljpeg -lpthread -lrt  ./libdtv/libdtv.a -L/usr/local/lib
/usr/lib/libjpeg.so /usr/local/lib/libvideogfx.so
/usr/local/lib/libvideocoding.so -lpng -lvideogfx -lvideocoding -lmad -o
vdr
/usr/i486-suse-linux/bin/ld: cannot find -lpng
collect2: ld returned 1 exit status
make: *** [vdr] Error 1

Jörg