diff --git a/example/README.md b/example/README.md
deleted file mode 100644
index 345e6aef713208c8d50cdea23b85e6ad831f0449..0000000000000000000000000000000000000000
--- a/example/README.md
+++ /dev/null
@@ -1 +0,0 @@
-Test
diff --git a/flake.nix b/flake.nix
index d510940e1df830bb739b544cd523610e1625db01..001373ee7afc960ce925bda186a828a0a02bc51b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -18,7 +18,7 @@
     load = p: n: {
       "${n}" =
         p.callCabal2nixWithOptions n
-        "${self}/${n}" "" {};
+        (nix-filter.lib {root = "${self}/${n}";}) "" {};
     };
     packages = final: p:
       {
diff --git a/rtree-c/package.yaml b/rtree-c/package.yaml
index 6a2525f974d9eb93aec586d4ef79c46b3b9c04a4..e2ad3d612e3bf9db6348006ac8f03e39443ea574 100644
--- a/rtree-c/package.yaml
+++ b/rtree-c/package.yaml
@@ -10,6 +10,11 @@ ghc-options: -Wall -fno-warn-incomplete-uni-patterns
 dependencies:
   - base >= 4.9 && < 5
   - rtree
+  - containers
+  - mtl
+  - vector
+  - pretty-simple
+  - transformers
   - language-c
 
 library:
diff --git a/rtree-c/rtree-c.cabal b/rtree-c/rtree-c.cabal
index 4d7d26cd37acc634ffe966104c739abeb09f6438..631e4ed46a89447b08cb08f671385f3a9ffd8af9 100644
--- a/rtree-c/rtree-c.cabal
+++ b/rtree-c/rtree-c.cabal
@@ -18,8 +18,13 @@ library
   ghc-options: -Wall -fno-warn-incomplete-uni-patterns
   build-depends:
       base >=4.9 && <5
+    , containers
     , language-c
+    , mtl
+    , pretty-simple
     , rtree
+    , transformers
+    , vector
   default-language: Haskell2010
 
 executable rtree-c
@@ -32,16 +37,21 @@ executable rtree-c
   build-depends:
       base >=4.9 && <5
     , co-log
+    , containers
     , directory
     , filepath
     , language-c
+    , mtl
     , optparse-applicative
     , pretty
+    , pretty-simple
     , rtree
     , rtree-c
     , text
     , time
+    , transformers
     , typed-process
+    , vector
   default-language: Haskell2010
 
 test-suite rtree-test
@@ -54,7 +64,12 @@ test-suite rtree-test
   ghc-options: -Wall -fno-warn-incomplete-uni-patterns
   build-depends:
       base >=4.9 && <5
+    , containers
     , language-c
+    , mtl
+    , pretty-simple
     , rtree
     , rtree-c
+    , transformers
+    , vector
   default-language: Haskell2010