- Build-Depends: base >= 3 && < 4,
- directory >= 1 && < 1.1,
+ Build-Depends: base >= 3 && < 4
+ if !flag(base3) && !flag(base4)
+ Build-Depends: base < 3
+
+ if flag(base4)
+ Build-Depends: concurrent >= 0.1 && < 0.2,
+ st >= 0.1 && < 0.2
+
+ if flag(base3) || flag(base4)
+ Build-Depends: directory >= 1 && < 1.1,