* As predicted, returning {} if a package isn't supported on a

  platform won't work: nix-env -qa barfs with "error: cannot coerce an
  attribute set (except a derivation) to a string".  So throw an error
  instead.  Anyway, condPackage/platformPackage doesn't belong in
  all-packages.nix (it should be specified in the package itself).

svn path=/nixpkgs/trunk/; revision=16870

1 files changed, 1 insertions, 1 deletions

diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index b8f1d631f4e08..db930fdda0268 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -195,7 +195,7 @@ let
         makeOverridable f (origArgs // (if builtins.isFunction newArgs then newArgs origArgs else newArgs));
     };
 
-  condPackage = condition: package: if condition then package else {};
+  condPackage = condition: package: if condition then package else throw "package not supported";
   platformPackage = platforms : package : 
     (condPackage (lib.any (x: x == system) platforms) package) //
     { meta.platforms = platforms; };