diff --git a/config.cpp b/config.cpp
index 274135cf..63248fa7 100644
--- a/config.cpp
+++ b/config.cpp
@@ -2277,6 +2277,7 @@ EX void display_embedded_errors() {
       }
     }
   if(meuclid && spatial_embedding == seProductS) {
+    #if CAP_RUG
     rug::clifford_torus ct;
     bool err = sqhypot_d(2, ct.xh) < 1e-3 && sqhypot_d(2, ct.yh) < 1e-3;
     if(err) {
@@ -2290,6 +2291,9 @@ EX void display_embedded_errors() {
         geom3::apply_settings_full(); start_game(); }); });
       return;
       }
+    #else
+    dialog::addInfo(XLAT("error: not supported"), 0xC00000);
+    #endif
     }
   if(msphere && !among(spatial_embedding, seNone, seDefault, seLowerCurvature, seMuchLowerCurvature, seProduct, seProductS)) {
     dialog::addInfo(XLAT("error: this method does not work in spherical geometry"), 0xC00000);
@@ -2330,6 +2334,7 @@ EX void show_spatial_embedding() {
     if(emb == geom3::seNone) {
       dialog::addBoolItem(XLAT("third-person perspective"), in_tpp(), 'T');
       dialog::add_action(geom3::switch_tpp);
+      #if CAP_RUG
       dialog::addBoolItem(XLAT("Hypersian Rug"), rug::rugged, 'u');
       dialog::add_action([] {
         if(in_tpp()) geom3::switch_tpp();
@@ -2338,6 +2343,7 @@ EX void show_spatial_embedding() {
           }
         else rug::close();
         });
+      #endif
       dialog::addBreak(100);
       }
     else {
@@ -2463,10 +2469,12 @@ EX void show3D() {
     dialog::addSelItem(XLAT("projection"), current_proj_name(), 'M');
     dialog::add_action_push(models::model_menu);  
     }
+  #if CAP_RUG
   if(GDIM == 2) {
     dialog::addItem(XLAT("configure Hypersian Rug"), 'u');
     dialog::add_action_push(rug::show);
     }
+  #endif
 
   #if MAXMDIM >= 4
   if(GDIM == 3) add_edit_fov('f');
diff --git a/embeddings.cpp b/embeddings.cpp
index 0b50e362..616848db 100644
--- a/embeddings.cpp
+++ b/embeddings.cpp
@@ -68,9 +68,13 @@ EX namespace geom3 {
     };
 
   EX bool clifford_torus_valid() {
+    #if CAP_RUG
     rug::clifford_torus ct;
     ld h = ct.xh | ct.yh;
     return !(sqhypot_d(2, ct.xh) < 1e-3 || sqhypot_d(2, ct.yh) < 1e-3 || abs(h) > 1e-3);
+    #else
+    return false;
+    #endif
     }
 
   EX string why_wrong(eSpatialEmbedding sp) {
@@ -198,6 +202,7 @@ EX namespace geom3 {
     }
 
   EX void configure_clifford_torus() {
+    #if CAP_RUG
     dynamicval<ld> dtessf(cgi.tessf, 1);
     rug::clifford_torus ct;
 
@@ -220,9 +225,11 @@ EX namespace geom3 {
     vid.depth = alpha - 1;
     vid.wall_height = min(1 / euclid_embed_scale_mean(), (90._deg - alpha) * 0.9);
     vid.eye = vid.wall_height / 2 - vid.depth;
+    #endif
     }
 
   EX void configure_cylinder() {
+    #if CAP_RUG
     dynamicval<ld> dtessf(cgi.tessf, 1);
     rug::clifford_torus ct;
     hyperpoint vec;
@@ -233,6 +240,7 @@ EX namespace geom3 {
     euclid_embed_scale = TAU / hypot_d(2, vec);
     euclid_embed_scale_y = 1;
     euclid_embed_rotate = atan2(vec[1], vec[0]) / degree;
+    #endif
     }
 
 EX }
@@ -425,22 +433,26 @@ struct emb_none : embedding_method {
 struct emb_actual : embedding_method {
 
   hyperpoint base_to_logical(hyperpoint h) override {
+    #if CAP_BT
     if(bt::in()) {
       auto h1 = bt::inverse_horopoint(h);
       h1[2] = 0; h1[3] = 1;
       return h1;
       }
+    #endif
     h /= h[2];
     h[2] = 0; h[3] = 1;
     return h;
     }
 
   hyperpoint logical_to_base(hyperpoint h) override {
+    #if CAP_BT
     if(bt::in()) {
       auto h1 = bt::get_horopoint(h);
       h1[3] = 1;
       return h1;
       }
+    #endif
     h[2] = 1; h = normalize(h);
     h[3] = 1;
     return h;
diff --git a/intra.cpp b/intra.cpp
index 1a657528..8223fe52 100644
--- a/intra.cpp
+++ b/intra.cpp
@@ -694,6 +694,7 @@ EX void world_list() {
   switch_to(c);
   dialog::end_list();
   dialog::addBreak(100);
+  #if CAP_EDIT
   dialog::addItem("add a saved world to the scene", 'a');
   dialog::add_action([] {
     dialog::openFileDialog(levelfile, XLAT("level to load:"), ".lev", [] () {
@@ -713,6 +714,7 @@ EX void world_list() {
         }
       });
     });
+  #endif
   dialog::addBack();
   dialog::display();
   }
diff --git a/sky.cpp b/sky.cpp
index 511e56e4..50879817 100644
--- a/sky.cpp
+++ b/sky.cpp
@@ -532,7 +532,9 @@ EX struct renderbuffer *airbuf;
 EX void swap_if_missing(bool missing) {
   if(!missing) return;
   arb::swap_vertices();
+  #if CAP_IRR
   irr::swap_vertices();
+  #endif
   }
 
 EX void make_air() {