diff --git a/rogueviz/rogueviz-all.cpp b/rogueviz/rogueviz-all.cpp
index c08226ef..fa4b3d17 100644
--- a/rogueviz/rogueviz-all.cpp
+++ b/rogueviz/rogueviz-all.cpp
@@ -28,7 +28,6 @@
 #include "impossible-ring.cpp"
 #include "triangle.cpp"
 #include "sumotron.cpp"
-#include "noniso-honeycombs.cpp"
 #include "random-walk.cpp"
 #include "fifteen.cpp"
 #include "crystal-sokoban.cpp"
@@ -58,11 +57,14 @@
 #include "playing-with-impossibility.cpp"
 #include "hyperbolic-minesweeper-pres.cpp"
 #include "dhrg-pres.cpp"
+#include "noniso-honeycombs.cpp"
 #endif
 #include "highdim-demo.cpp"
 #include "horo63.cpp"
 #include "platformer.cpp"
+#if CAP_RAY && MAXMDIM >= 4
 #include "intra-demos.cpp"
+#endif
 #include "gobot.cpp"
 #include "extra-projections.cpp"
 #include "balloonsim.cpp"
diff --git a/rogueviz/snow.cpp b/rogueviz/snow.cpp
index f903456c..09bb24c7 100644
--- a/rogueviz/snow.cpp
+++ b/rogueviz/snow.cpp
@@ -191,6 +191,7 @@ bool draw_snow(cell *c, const shiftmatrix& V) {
 
 string cap = "non-Euclidean snowballs/";
 
+#if CAP_RVSLIDES
 void snow_slide(vector<tour::slide>& v, string title, string desc, reaction_t t) {
   using namespace tour;
   v.push_back(
@@ -219,6 +220,7 @@ void snow_slide(vector<tour::slide>& v, string title, string desc, reaction_t t)
     }}
     );
   }
+#endif
 
 void show() {
   cmode = sm::SIDE | sm::MAYDARK;
@@ -299,6 +301,7 @@ auto hchook = addHook(hooks_drawcell, 100, draw_snow)
     param_b(just_centered, "snow_just_centered");
     })
 
+#if CAP_RVSLIDES
 + addHook_rvslides(161, [] (string s, vector<tour::slide>& v) {
   if(s != "noniso") return;
   v.push_back(tour::slide{
@@ -372,7 +375,9 @@ auto hchook = addHook(hooks_drawcell, 100, draw_snow)
     snow_lambda = 3;
     });
 #endif
-  });
+  })
+#endif
+  + 0;
 
 }
 }
diff --git a/rogueviz/triangle.cpp b/rogueviz/triangle.cpp
index 33311f60..6f905250 100644
--- a/rogueviz/triangle.cpp
+++ b/rogueviz/triangle.cpp
@@ -497,6 +497,7 @@ bool draw_ptriangle(cell *c, const shiftmatrix& V) {
   return false;
   }
 
+#if CAP_RVSLIDES
 void slide_itri(tour::presmode mode, int id) {
   using namespace tour;
   setCanvas(mode, '0');
@@ -524,6 +525,7 @@ void slide_itri(tour::presmode mode, int id) {
     }     
   rogueviz::pres::non_game_slide_scroll(mode);
   }
+#endif
 
 string cap = "Impossible architecture in Nil/";
 
@@ -546,9 +548,11 @@ auto hchook = addHook(hooks_drawcell, 100, draw_ptriangle)
     }
   else return 1;
   return 0;
-  })
+  });
 
-+ addHook_rvslides(166, [] (string s, vector<tour::slide>& v) {
+#if CAP_RVSLIDES
+auto hcslides =
+  addHook_rvslides(166, [] (string s, vector<tour::slide>& v) {
   using namespace tour;
   if(s != "noniso") return;
 
@@ -585,6 +589,7 @@ auto hchook = addHook(hooks_drawcell, 100, draw_ptriangle)
     slide_itri(mode, 2);
     }});
   });
+#endif
 
 }
 }
\ No newline at end of file