diff --git a/examples/drawing-c/Makefile b/examples/drawing-c/Makefile
index 6e25281..7317211 100644
--- a/examples/drawing-c/Makefile
+++ b/examples/drawing-c/Makefile
@@ -1,15 +1,25 @@
-CFLAGS ?= -Wall -Wextra -std=c99
+CFLAGS ?= -I../.. -Wall -Wextra -std=c99
+
+# debug
+# CFLAGS += -g
 
 ifeq ($(OS),Windows_NT)
 	LDFLAGS = -lgdi32
+	TARGET_EXT = .exe
 else
 	UNAME_S := $(shell uname -s)
-	ifeq ($(UNAME_S),Darwin)
+	ifneq (,$(findstring emcc,$(CC)))
+		LDFLAGS = -lm -sASYNCIFY=1 -sSTACK_SIZE=524288
+		TARGET_EXT = .html
+	else ifeq ($(UNAME_S),Darwin)
 		LDFLAGS = -framework Cocoa
 	else
-		LDFLAGS = -lX11
+		LDFLAGS = -lX11 -lasound -lm
+		TARGET_EXT =
 	endif
 endif
 
-main: main.c ../../fenster.h
-	$(CC) main.c -I../.. -o $@ $(CFLAGS) $(LDFLAGS)
+TARGET = main$(TARGET_EXT)
+
+$(TARGET): main.c
+	$(CC) $? -o $(TARGET) $(CFLAGS) $(LDFLAGS)
diff --git a/examples/drawing-c/main.c b/examples/drawing-c/main.c
index 5e091e0..a8fed9b 100644
--- a/examples/drawing-c/main.c
+++ b/examples/drawing-c/main.c
@@ -1,4 +1,8 @@
+#ifdef EMSCRIPTEN
+#include "fenster-emscripten.h"
+#else
 #include "fenster.h"
+#endif
 
 #define W 320
 #define H 240
diff --git a/examples/input-c/Makefile b/examples/input-c/Makefile
index 6e25281..7317211 100644
--- a/examples/input-c/Makefile
+++ b/examples/input-c/Makefile
@@ -1,15 +1,25 @@
-CFLAGS ?= -Wall -Wextra -std=c99
+CFLAGS ?= -I../.. -Wall -Wextra -std=c99
+
+# debug
+# CFLAGS += -g
 
 ifeq ($(OS),Windows_NT)
 	LDFLAGS = -lgdi32
+	TARGET_EXT = .exe
 else
 	UNAME_S := $(shell uname -s)
-	ifeq ($(UNAME_S),Darwin)
+	ifneq (,$(findstring emcc,$(CC)))
+		LDFLAGS = -lm -sASYNCIFY=1 -sSTACK_SIZE=524288
+		TARGET_EXT = .html
+	else ifeq ($(UNAME_S),Darwin)
 		LDFLAGS = -framework Cocoa
 	else
-		LDFLAGS = -lX11
+		LDFLAGS = -lX11 -lasound -lm
+		TARGET_EXT =
 	endif
 endif
 
-main: main.c ../../fenster.h
-	$(CC) main.c -I../.. -o $@ $(CFLAGS) $(LDFLAGS)
+TARGET = main$(TARGET_EXT)
+
+$(TARGET): main.c
+	$(CC) $? -o $(TARGET) $(CFLAGS) $(LDFLAGS)
diff --git a/examples/input-c/main.c b/examples/input-c/main.c
index 255ce51..f6839ee 100644
--- a/examples/input-c/main.c
+++ b/examples/input-c/main.c
@@ -1,4 +1,8 @@
+#ifdef EMSCRIPTEN
+#include "fenster-emscripten.h"
+#else
 #include "fenster.h"
+#endif
 
 #define W 320
 #define H 240
diff --git a/examples/minimal-c/Makefile b/examples/minimal-c/Makefile
index 70678f2..7317211 100644
--- a/examples/minimal-c/Makefile
+++ b/examples/minimal-c/Makefile
@@ -12,7 +12,7 @@ else
 		LDFLAGS = -lm -sASYNCIFY=1 -sSTACK_SIZE=524288
 		TARGET_EXT = .html
 	else ifeq ($(UNAME_S),Darwin)
-		LDFLAGS = -framework Cocoa -framework AudioToolbox
+		LDFLAGS = -framework Cocoa
 	else
 		LDFLAGS = -lX11 -lasound -lm
 		TARGET_EXT =
diff --git a/fenster-emscripten.h b/fenster-emscripten.h
index 78e2925..3d8f39c 100644
--- a/fenster-emscripten.h
+++ b/fenster-emscripten.h
@@ -12,10 +12,10 @@ struct fenster {      // byte   32bit
   const int height;   // 8      2
   uint32_t *buf;      // 12     3
   int keys[256];      // 16     4
-  int mod;            // 1040   257
-  int x;              // 1044   258
-  int y;              // 1048   259
-  int mouse;          // 1052   260
+  int mod;            // 1040   260
+  int x;              // 1044   261
+  int y;              // 1048   262
+  int mouse;          // 1052   263
 };
 
 #define fenster_pixel(f, x, y) ((f)->buf[((y) * (f)->width) + (x)])
@@ -42,16 +42,16 @@ EM_JS(int, fenster_open, (struct fenster *f), {
   // TODO: handle mod
 
   Module.canvas.addEventListener('mousemove', e => {
-    Module.HEAP32[p32 + 258] = e.offsetX;
-    Module.HEAP32[p32 + 259] = e.offsetY;
+    Module.HEAP32[p32 + 261] = e.offsetX;
+    Module.HEAP32[p32 + 262] = e.offsetY;
   });
 
   Module.canvas.addEventListener('mousedown', e => {
-    Module.HEAP32[p32 + 260] = e.which;
+    Module.HEAP32[p32 + 263] = e.which;
   });
 
   Module.canvas.addEventListener('mouseup', e => {
-    Module.HEAP32[p32 + 260] = 0;
+    Module.HEAP32[p32 + 263] = 0;
   });
 
   Module.canvas.addEventListener('keydown', e => {