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ncurses/edit.sed

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#!/usr/bin/bash
while test "${1::2}" = "--" ; do
case "$1" in
--cflags=*)
cflags="${cflags:+$cflags }${1#*=}"
shift
;;
--cflags)
cflags="${cflags:+$cflags }$2"
shift 2
;;
--libs=*)
libs="${libs:+$libs }${1#*=}"
shift
;;
--libs)
libs="${libs:+$libs }$2"
shift 2
;;
esac
done
sed -ri -e "
/^[[:blank:]]*--cflags\)/,/;;/ {
/;;/ a\\
--cflags)\\
echo $cflags\\
;;
d
}
/^[[:blank:]]*--libs\)/,/;;/ {
/;;/ a\\
--libs)\\
echo $libs\\
;;
d
}" ${1+"$@"}