diff --git a/default.nix b/default.nix
index a4b135e2..5eb886bf 100644
--- a/default.nix
+++ b/default.nix
@@ -77,7 +77,6 @@ let
 
       in
         {
-          xo-ratio          = self.callPackage pkgs/xo-ratio.nix          { buildDocs = true; };
           xo-unit           = self.callPackage pkgs/xo-unit.nix           { buildDocs = true; };
 #
           xo-expression     = self.callPackage pkgs/xo-expression.nix     {};
@@ -108,6 +107,7 @@ let
             xo-reflectutil    = self.callPackage pkgs/xo-reflectutil.nix    {};
             xo-reflect        = self.callPackage pkgs/xo-reflect.nix        {};
             xo-pyreflect      = self.callPackage pkgs/xo-pyreflect.nix      {};
+            xo-ratio          = self.callPackage pkgs/xo-ratio.nix          { buildDocs = true; buildExamples = true; };
             xo-pyunit         = self.callPackage pkgs/xo-pyunit.nix         {};
             #
             xo-callback       = self.callPackage pkgs/xo-callback.nix       {};
diff --git a/pkgs/xo-ratio.nix b/pkgs/xo-ratio.nix
index 0a13db3d..fd7c4af0 100644
--- a/pkgs/xo-ratio.nix
+++ b/pkgs/xo-ratio.nix
@@ -6,9 +6,10 @@
 
   doxygen, sphinx, graphviz,
 
-  xo-cmake, xo-flatstring, xo-reflectutil,
+  xo-cmake, xo-flatstring, xo-reflectutil, xo-indentlog,
 
   buildDocs ? false,
+  buildExamples ? false,
 } :
 
 stdenv.mkDerivation (finalattrs:
@@ -18,9 +19,13 @@ stdenv.mkDerivation (finalattrs:
 
     src = ../xo-ratio;
 
-    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"];
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"]
+                 ++ lib.optionals buildDocs ["-DXO_ENABLE_DOCS=on"]
+                 ++ lib.optionals buildExamples ["-DXO_ENABLE_EXAMPLES=on"];
 
     inherit buildDocs;
+    inherit buildExamples;
+
     doCheck = true;
 
     postBuild = lib.optionalString buildDocs ''
@@ -35,6 +40,9 @@ stdenv.mkDerivation (finalattrs:
       xo-flatstring
       xo-reflectutil
     ]
+    ++ lib.optionals buildExamples [
+      xo-indentlog
+    ]
     ++ lib.optionals buildDocs [
       doxygen
       sphinx
@@ -42,5 +50,6 @@ stdenv.mkDerivation (finalattrs:
       python3Packages.sphinx-rtd-theme
       python3Packages.breathe
       python3Packages.sphinxcontrib-ditaa
+      #python3Packages.sphinxcontrib-plantuml
     ];
   })