command -v \gpg-agent >/dev/null 2>&1 || { echo >&2 "WARNING: gnupg-agent isn't installed. You should install it, because it's used by gpg.conf and xsessionrc in shell-things."; }
command -v \curl >/dev/null 2>&1 || { echo >&2 "WARNING: curl isn't installed! You should install it, because it's used by some aliases orfunctions."; }