diff --git a/lib/default.nix b/lib/default.nix
index 40ac8af..f86c948 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -1,6 +1,6 @@
 final: prev:
 let
-  inherit (prev) isFunction;
+  inherit (prev) isFunction mkMerge mkIf;
 in
 rec {
   # Ternary operator
@@ -15,4 +15,9 @@ rec {
   right = f: g: tern (isFunction g)
     (right (x: f (g (x))))
     (f (g));
+
+  mkIfElse = predicate: yes: no: mkMerge [
+    (mkIf predicate yes)
+    (mkIf (!predicate) no)
+  ];
 }