matterhorn: fix build

also fixes mattermost-api, mattermost-api-qc,
and adds them to stewardship by kiwi

pkgs/development/haskell-modules/configuration-common.nix

@@ -1463,6 +1463,18 @@ self: super: {
   # haskell-ci-0.8 needs cabal-install-parsers ==0.1, but we have 0.2.
   haskell-ci = doJailbreak super.haskell-ci;
 
+  # 2020-01-19 - there were conflicting versions of brick, vty, and brick-skylighting;
+  # multiple versions of them were being pulled in by the others which is not allowed.
+  # There are more complicated ways of doing this but I was able to make it fairly simple -- kiwi
+  # 2020-03-31 - "..." it broke again. so here's a more complicated way -- kiwi
+  matterhorn = super.matterhorn.override {
+    brick-skylighting = self.brick-skylighting.override {
+      brick = self.brick_0_52_1.override {
+        vty = self.vty_5_28_2;
+      };
+    };
+  };
+
   persistent-mysql = dontCheck super.persistent-mysql;
 
   # Fix EdisonAPI and EdisonCore for GHC 8.8:

pkgs/development/haskell-modules/configuration-hackage2nix.yaml

@@ -2459,6 +2459,9 @@ package-maintainers:
     - streaming-wai
   kiwi:
     # - glirc
+    - matterhorn
+    - mattermost-api
+    - mattermost-api-qc
     - Unique
   psibi:
     - path-pieces
@@ -7329,9 +7332,6 @@ broken-packages:
   - matrix-as-xyz
   - matrix-market
   - matsuri
-  - matterhorn
-  - mattermost-api
-  - mattermost-api-qc
   - maude
   - maxent
   - maxent-learner-hw