@@ -1,7 +1,7 @@
 me=$0
 say() { echo >&2 "($me) $1";      }
-has() { which $1 >/dev/null 2>&1; return $?; }
+has() { command -v $1 >/dev/null 2>&1; return $?; }
 check() {
 	var=$1
 	test "${!var}" == "" || return 0
 	say "we were not able to detect a default value for the configuration variable \$$var. please set this variable to $2 and try again."