diff --git a/hyperweb.cpp b/hyperweb.cpp
index 752abf70..bc4edd14 100644
--- a/hyperweb.cpp
+++ b/hyperweb.cpp
@@ -2,19 +2,14 @@
 // This is the main file when the online version of HyperRogue is compiled with Emscripten.
 // Copyright (C) 2011-2018 Zeno Rogue, see 'hyper.cpp' for details
 
+#ifndef ISWEB
 #define ISWEB 1
 #define ISMINI 0
-#define CAP_AUDIO 0
-#define CAP_SDLGFX 0
-#define CAP_PNG 0
-#define CAP_TOUR 1
-#define CAP_SDLTTF 0
-#define CAP_SHMUP 0
-#define CAP_RUG 1
 #define CAP_INV 0
 #define CAP_URL 1
 #define GLES_ONLY
-#define CAP_COMPLEX2 1
+#define SCU
+#endif
 
 #if CAP_ROGUEVIZ
 #define MAXMDIM 4
@@ -53,7 +48,11 @@ namespace hr {
   void offer_download(std::string sfilename, std::string smimetype);
   }
 
+#ifdef SCU
 #include "hyper.cpp"
+#else
+#include "hyper.h"
+#endif
 
 namespace hr {
 
@@ -72,7 +71,7 @@ string get_value(string name) {
   return res;
   }
 
-void offer_download(string sfilename, string smimetype) {
+EX void offer_download(string sfilename, string smimetype) {
 
   EM_ASM({
     var name = UTF8ToString($0, $1);
@@ -105,7 +104,7 @@ extern "C" {
     }
   }
 
-void offer_choose_file(reaction_t r) {
+EX void offer_choose_file(reaction_t r) {
   on_use_file = r;
   EM_ASM({
     fileElem.click();
@@ -221,7 +220,7 @@ EM_BOOL fsc_callback(int eventType, const EmscriptenFullscreenChangeEvent *fulls
   return true;
   }
 
-void initweb() {
+EX void initweb() {
   // toggleanim(false);
   emscripten_set_fullscreenchange_callback(0, NULL, false, fsc_callback);
   printf("showstartmenu = %d\n", showstartmenu);
@@ -241,7 +240,7 @@ transmatrix getOrientation() {
   }
 #endif
 
-void emscripten_get_commandline() {
+EX void emscripten_get_commandline() {
 #ifdef EMSCRIPTEN_FIXED_ARG
   string s = EMSCRIPTEN_FIXED_ARG;
 #else
diff --git a/language.cpp b/language.cpp
index 36738b28..1d5dea17 100644
--- a/language.cpp
+++ b/language.cpp
@@ -62,7 +62,10 @@ struct fullnoun {
   };
 
 #if !CAP_TRANS
+#if HDR
 #define NUMEXTRA 11
+extern const char* natchars[NUMEXTRA];
+#endif
 const char* natchars[NUMEXTRA] = {"°","é","á", "²", "½", "Θ", "δ", "π", "ϕ", "ᵈ", "∞"};
 #endif
 
diff --git a/multi.cpp b/multi.cpp
index 2b8d3525..7bf1ae58 100644
--- a/multi.cpp
+++ b/multi.cpp
@@ -638,6 +638,7 @@ EX void initConfig() {
   multi::scs[5].uicolor = 0x00C0C0FF;
   multi::scs[6].uicolor = 0xC0C0C0FF;
   
+  #if CAP_CONFIG
   addsaver(multi::players, "mode-number of players");
   addsaver(alwaysuse, "use configured keys");  
   // unfortunately we cannot use key names here because SDL is not yet initialized
@@ -656,6 +657,7 @@ EX void initConfig() {
       }
     }
   for(int i=0; i<7; i++) addsaver(multi::scs[i], "player"+its(i));
+  #endif
   }
 
 EX void handleInput(int delta) {
diff --git a/mymake.cpp b/mymake.cpp
index 4dbcdb97..2d4ca6d7 100644
--- a/mymake.cpp
+++ b/mymake.cpp
@@ -59,6 +59,19 @@ void set_win() {
   standard = "";
   }
 
+void set_web() {
+  preprocessor = "/usr/lib/emscripten/em++ -E";
+  compiler = "/usr/lib/emscripten/em++ -c";
+  default_standard = standard = " -std=c++17";
+  opts = "-DISWEB=1";
+  linker = 
+    "/usr/lib/emscripten/em++ -s USE_ZLIB=1 -s DISABLE_DEPRECATED_FIND_EVENT_TARGET_BEHAVIOR=0 -s TOTAL_MEMORY=512MB "
+    "-s EXTRA_EXPORTED_RUNTIME_METHODS='[\"FS\",\"ccall\"]' "
+    "-s EXPORTED_FUNCTIONS=\"['_main', '_use_file']\" "
+    "-s DISABLE_EXCEPTION_CATCHING=0 -o mhyper.html";
+  libs = "";
+  }
+
 vector<string> modules;
 
 time_t get_file_time(const string s) {
@@ -118,6 +131,12 @@ int main(int argc, char **argv) {
       obj_dir += "/linux";
       setdir += "../";
       }
+    else if(s == "-web") {
+      set_web();
+      modules.push_back("hyperweb");
+      obj_dir += "/web";
+      setdir += "../";
+      }
     else if(s.substr(0, 2) == "-f") {
       opts += " " + s;
       obj_dir += "/";
diff --git a/nofont.cpp b/nofont.cpp
index 90ebeb78..de994a34 100644
--- a/nofont.cpp
+++ b/nofont.cpp
@@ -127,11 +127,11 @@ unsigned char fonttable[] = {
 
 unsigned char *ftv = fonttable;
 
-void resetTabFont() {
+EX void resetTabFont() {
   ftv = fonttable;
   }
   
-void loadCompressedChar(int &otwidth, int &otheight, unsigned char *tpix) {
+EX void loadCompressedChar(int &otwidth, int &otheight, unsigned char *tpix) {
   if(*ftv == 255) {
     fprintf(stderr, "There is something wrong with the font table\n");
     exit(1);
diff --git a/sysconfig.h b/sysconfig.h
index 075579ce..b76ad296 100644
--- a/sysconfig.h
+++ b/sysconfig.h
@@ -206,7 +206,7 @@
 #endif
 
 #ifndef CAP_TOUR
-#define CAP_TOUR (!ISWEB && !ISMINI)
+#define CAP_TOUR (!ISMINI)
 #endif
 
 #ifndef CAP_ROGUEVIZ
@@ -285,7 +285,7 @@
 #endif
 
 #ifndef CAP_SHMUP
-#define CAP_SHMUP 1
+#define CAP_SHMUP (!ISWEB)
 #endif
 
 #ifndef CAP_BITFIELD
@@ -403,6 +403,10 @@ extern "C" {
 #define CAP_GLEW (CAP_GL && !ISMOBILE && !ISMAC && !ISLINUX && !ISWEB)
 #endif
 
+#if ISWEB
+#define GLES_ONLY
+#endif
+
 #if CAP_GL
 #if CAP_GLEW
   #include <GL/glew.h>
@@ -462,6 +466,11 @@ typedef unsigned GLuint;
 #include <zlib.h>
 #endif
 
+#if ISWEB
+#include <emscripten.h>
+#include <emscripten/html5.h>
+#endif
+
 #if CAP_GMP
 #include <gmpxx.h>
 #endif