More header fiddling: crypt.h is silly, SUSv4 requires crypt() to be prototyped in unistd.h. The fact glibc refuses to do so without a wacky #define is a glibc bug, treat it as such.

#!/bin/sh
#HELP usage: unix2dos [FILE...]\n\nAdd DOS newlines

[ $# -ne 0 ] && DASH_I=-i
sed $DASH_I -e 's/$/\r/' "$@"