diff --git a/Makefile b/Makefile
index b7b37ce..ebd3606 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,16 @@
 
+DEBUG=false
+
 CFLAGS := -fno-plt -O1 -std=gnu11 -nostartfiles -Wall -Wextra
 CFLAGS += -fno-stack-protector -fno-stack-check -fno-unwind-tables -fno-asynchronous-unwind-tables -fomit-frame-pointer
 CFLAGS += -no-pie -fno-pic -fno-PIE -fno-PIC -march=core2 -ffunction-sections -fdata-sections
 
+ifeq ($(DEBUG),false)
+	CFLAGS += -nostdlib
+else
+	CFLAGS += -DDEBUG=true
+endif
+
 .PHONY: clean checkgccversion noelfver
 
 all : checkgccversion gtk-opengl xlib-opengl sdl2-opengl
diff --git a/README.md b/README.md
index 78f58e8..bebc278 100644
--- a/README.md
+++ b/README.md
@@ -4,15 +4,15 @@ Here are examples of rendering a shader full screen on linux. All of these examp
 
 There are three examples, each using a different library to open a window and get an opengl context.
 
-## xlib-opengl - 1503 bytes
+## xlib-opengl - 1492 bytes
 
-Vanilla xlib is the largest of the bunch and the most brittle. It is highly not recommended to use xlib in a demo unless you cannot assume these other libraries will be on the system.
+Vanilla xlib is the largest of the bunch and the most brittle. It is highly not recommended to use xlib in a demo unless you cannot assume these other libraries will be on the system. (note, unlike all the other programs that close with the window manager's quit key combination, this program must be closed with ESC.)
 
-## gtk-opengl - 1396 bytes
+## gtk-opengl - 1382 bytes
 
 GTK is a step up from xlib, being both smaller and more robust. If the compo you are entering doesn't allow using SDL2, GTK is an ok alternative. Before switching to GCC 8.3.0, this was 100 bytes smaller than it is now. I am not sure why it is larger, but this likely means it can be sizecoded/stripped further.
 
-## sdl2-opengl - 1010 bytes
+## sdl2-opengl - 996 bytes
 
 Using SDL2 will give you very small binaries. Use SDL2 whenever you can, as it also has a few other useful subsystems at minimal cost (for example, audio.)
 
diff --git a/sdl2-opengl.c b/sdl2-opengl.c
index 543bec7..d203eea 100644
--- a/sdl2-opengl.c
+++ b/sdl2-opengl.c
@@ -94,7 +94,13 @@ void _start() {
 				|| (Event.type == SDL_KEYDOWN && Event.key.keysym.sym == SDLK_ESCAPE)
 #endif
 			) {
-				exit(0);
+				asm volatile(".intel_syntax noprefix");
+				asm volatile("push 231"); //exit_group
+				asm volatile("pop rax");
+				asm volatile("xor edi, edi");
+				asm volatile("syscall");
+				asm volatile(".att_syntax prefix");
+				__builtin_unreachable();
 			}
 			if (Event.type == SDL_WINDOWEVENT) {
 				switch(Event.window.event) {