- version<? VER1 VER2 #!optional TAIL-ZERO?procedure
- version=? VER1 VER2 #!optional TAIL-ZERO?procedure
- version>? VER1 VER2 #!optional TAIL-ZERO?procedure
- version<=? VER1 VER2 #!optional TAIL-ZERO?procedure
- version>=? VER1 VER2 #!optional TAIL-ZERO?procedure
See version-compare.