usage()

{

cat <<EOF

Usage: libpng-config [OPTION] ...

Known values for OPTION are:

--prefix print libpng prefix

--libdir print path to directory containing library

--libs print library linking information

--ccopts print compiler options

--cppflags print pre-processor flags

--cflags print preprocessor flags, I_opts, and compiler options

--I_opts print "-I" include options

--L_opts print linker "-L" flags for dynamic linking

--R_opts print dynamic linker "-R" or "-rpath" flags

--ldopts print linker options

--ldflags print linker flags (ldopts, L_opts, R_opts, and libs)

--static revise subsequent outputs for static linking

--help print this help and exit

--version print version information

EOF

exit $1

}

if test $# -eq 0; then

usage 1

fi

while test $# -gt 0; do

case "$1" in

--prefix)

echo ${prefix}

;;

--version)

echo ${version}

exit 0

;;

--help)

usage 0

;;

--ccopts)

echo ${ccopts}

;;

--cppflags)

echo ${cppflags}

;;

--cflags)

echo ${I_opts} ${cppflags} ${ccopts}

;;

--libdir)

echo ${libdir}

;;

--libs)

echo ${libs}

;;

--I_opts)

echo ${I_opts}

;;

--L_opts)

echo ${L_opts}

;;

--R_opts)

echo ${R_opts}

;;

--ldflags)

echo ${ldflags} ${L_opts} ${R_opts} ${libs}

;;

--static)

R_opts=""

;;

*)

usage

exit 1

;;

esac

shift

done

exit 0