[root@wave bandwidthd-2.0.1]# ./configure
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking for bison... bison -y
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for executable suffix...
checking for object suffix... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for a BSD compatible install... /usr/bin/install -c
checking for flex... flex
checking for yywrap in -lfl... yes
checking lex output file root... lex.yy
checking whether yytext is a pointer... yes
checking how to run the C preprocessor... gcc -E
checking for X... no
checking for /sw/lib... no
checking for /sw/include... no
checking for /usr/pkg/lib... no
checking for /usr/pkg/include... no
checking for connect in -lsocket... no
checking for gethostbyname in -lnsl... yes
checking for inet_aton in -lresolv... yes
checking for pow in -lm... yes
checking for libiconv_open in -liconv... no
checking for png_read_info in -lpng... no
configure: error: Bandwidthd requires but cannot libpng
