R: add man output

pkgs/applications/science/math/R/default.nix

@@ -59,6 +59,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   outputs = [
     "out"
+    "man"
     "tex"
   ];
 

pkgs/development/r-modules/wrapper.nix

@@ -11,6 +11,11 @@ symlinkJoin {
   preferLocalBuild = true;
   allowSubstitutes = false;
 
+  outputs = [
+    "out"
+    "man"
+  ];
+
   buildInputs = [ R ] ++ recommendedPackages ++ packages;
   paths = [ R ];
 
@@ -24,6 +29,8 @@ symlinkJoin {
       makeWrapper "${R}/bin/$exe" "$out/bin/$exe" \
         --prefix "R_LIBS_SITE" ":" "$R_LIBS_SITE"
     done
+
+    ln -s ${R.man} $man
   '';
 
   # Make the list of recommended R packages accessible to other packages such as rpy2