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-# Option Definitions {#sec-option-definitions}
-
-Option definitions are generally straight-forward bindings of values to
-option names, like
-
-```nix
-config = {
-  services.httpd.enable = true;
-};
-```
-
-However, sometimes you need to wrap an option definition or set of
-option definitions in a *property* to achieve certain effects:
-
-## Delaying Conditionals {#sec-option-definitions-delaying-conditionals .unnumbered}
-
-If a set of option definitions is conditional on the value of another
-option, you may need to use `mkIf`. Consider, for instance:
-
-```nix
-config = if config.services.httpd.enable then {
-  environment.systemPackages = [ ... ];
-  ...
-} else {};
-```
-
-This definition will cause Nix to fail with an "infinite recursion"
-error. Why? Because the value of `config.services.httpd.enable` depends
-on the value being constructed here. After all, you could also write the
-clearly circular and contradictory:
-
-```nix
-config = if config.services.httpd.enable then {
-  services.httpd.enable = false;
-} else {
-  services.httpd.enable = true;
-};
-```
-
-The solution is to write:
-
-```nix
-config = mkIf config.services.httpd.enable {
-  environment.systemPackages = [ ... ];
-  ...
-};
-```
-
-The special function `mkIf` causes the evaluation of the conditional to
-be "pushed down" into the individual definitions, as if you had written:
-
-```nix
-config = {
-  environment.systemPackages = if config.services.httpd.enable then [ ... ] else [];
-  ...
-};
-```
-
-## Setting Priorities {#sec-option-definitions-setting-priorities .unnumbered}
-
-A module can override the definitions of an option in other modules by
-setting a *priority*. All option definitions that do not have the lowest
-priority value are discarded. By default, option definitions have
-priority 1000. You can specify an explicit priority by using
-`mkOverride`, e.g.
-
-```nix
-services.openssh.enable = mkOverride 10 false;
-```
-
-This definition causes all other definitions with priorities above 10 to
-be discarded. The function `mkForce` is equal to `mkOverride 50`.
-
-## Merging Configurations {#sec-option-definitions-merging .unnumbered}
-
-In conjunction with `mkIf`, it is sometimes useful for a module to
-return multiple sets of option definitions, to be merged together as if
-they were declared in separate modules. This can be done using
-`mkMerge`:
-
-```nix
-config = mkMerge
-  [ # Unconditional stuff.
-    { environment.systemPackages = [ ... ];
-    }
-    # Conditional stuff.
-    (mkIf config.services.bla.enable {
-      environment.systemPackages = [ ... ];
-    })
-  ];
-```