diff --git a/clients/Makefile.am b/clients/Makefile.am
index dd11382b..23771898 100644
--- a/clients/Makefile.am
+++ b/clients/Makefile.am
@@ -11,6 +11,12 @@ libexec_PROGRAMS =				\
 	$(tablet_shell)				\
 	$(screenshooter)
 
+AM_CFLAGS = $(GCC_CFLAGS)
+AM_CPPFLAGS =					\
+	-DDATADIR='"$(datadir)"'		\
+	-DBINDIR='"$(bindir)"'			\
+	$(CLIENT_CFLAGS) $(CAIRO_EGL_CFLAGS)
+
 if BUILD_SIMPLE_CLIENTS
 simple_clients_programs =			\
 	simple-egl				\
@@ -18,12 +24,15 @@ simple_clients_programs =			\
 	simple-touch
 
 simple_egl_SOURCES = simple-egl.c
+simple_egl_CPPFLAGS = $(SIMPLE_CLIENT_CFLAGS)
 simple_egl_LDADD = $(SIMPLE_CLIENT_LIBS) -lm
 
 simple_shm_SOURCES = simple-shm.c
+simple_shm_CPPFLAGS = $(SIMPLE_CLIENT_CFLAGS)
 simple_shm_LDADD = $(SIMPLE_CLIENT_LIBS)
 
 simple_touch_SOURCES = simple-touch.c
+simple_touch_CPPFLAGS = $(SIMPLE_CLIENT_CFLAGS)
 simple_touch_LDADD = $(SIMPLE_CLIENT_LIBS)
 endif
 
@@ -46,12 +55,6 @@ screenshooter = weston-screenshooter
 
 noinst_LIBRARIES = libtoytoolkit.a
 
-AM_CFLAGS = $(GCC_CFLAGS)
-AM_CPPFLAGS =					\
-	-DDATADIR='"$(datadir)"'		\
-	-DBINDIR='"$(bindir)"'			\
-	$(CLIENT_CFLAGS) $(CAIRO_EGL_CFLAGS)
-
 libtoytoolkit_a_SOURCES =			\
 	window.c				\
 	window.h				\
diff --git a/clients/simple-shm.c b/clients/simple-shm.c
index d1fe0c68..16f718c1 100644
--- a/clients/simple-shm.c
+++ b/clients/simple-shm.c
@@ -31,7 +31,6 @@
 #include <signal.h>
 
 #include <wayland-client.h>
-#include <wayland-egl.h>
 
 struct display {
 	struct wl_display *display;
@@ -101,6 +100,17 @@ create_window(struct display *display, int width, int height)
 	struct window *window;
 	
 	window = malloc(sizeof *window);
+
+	window->buffer = create_shm_buffer(display,
+					   width, height,
+					   WL_SHM_FORMAT_XRGB8888,
+					   &window->shm_data);
+
+	if (!window->buffer) {
+		free(window);
+		return NULL;
+	}
+
 	window->callback = NULL;
 	window->display = display;
 	window->width = width;
@@ -108,10 +118,6 @@ create_window(struct display *display, int width, int height)
 	window->surface = wl_compositor_create_surface(display->compositor);
 	window->shell_surface = wl_shell_get_shell_surface(display->shell,
 							   window->surface);
-	window->buffer = create_shm_buffer(display,
-					   width, height,
-					   WL_SHM_FORMAT_XRGB8888,
-					   &window->shm_data);
 
 	wl_shell_surface_set_toplevel(window->shell_surface);
 
@@ -130,21 +136,56 @@ destroy_window(struct window *window)
 	free(window);
 }
 
+static void
+paint_pixels(void *image, int width, int height, uint32_t time)
+{
+	const int halfh = height / 2;
+	const int halfw = width / 2;
+	int ir, or;
+	uint32_t *pixel = image;
+	int y;
+
+	/* squared radii thresholds */
+	or = (halfw < halfh ? halfw : halfh) - 8;
+	ir = or - 32;
+	or *= or;
+	ir *= ir;
+
+	for (y = 0; y < height; y++) {
+		int x;
+		int y2 = (y - halfh) * (y - halfh);
+
+		for (x = 0; x < width; x++) {
+			uint32_t v;
+
+			/* squared distance from center */
+			int r2 = (x - halfw) * (x - halfw) + y2;
+
+			if (r2 < ir)
+				v = (r2 / 32 + time / 64) * 0x0080401;
+			else if (r2 < or)
+				v = (y + time / 32) * 0x0080401;
+			else
+				v = (x + time / 16) * 0x0080401;
+			v &= 0x00ffffff;
+
+			/* cross if compositor uses X from XRGB as alpha */
+			if (abs(x - y) > 6 && abs(x + y - height) > 6)
+				v |= 0xff000000;
+
+			*pixel++ = v;
+		}
+	}
+}
+
 static const struct wl_callback_listener frame_listener;
 
 static void
 redraw(void *data, struct wl_callback *callback, uint32_t time)
 {
 	struct window *window = data;
-	uint32_t *p;
-	int i, end, offset;
-
-	p = window->shm_data;
-	end = window->width * window->height;
-	offset = time >> 4;
-	for (i = 0; i < end; i++)
-		p[i] = (i + offset) * 0x0080401;
 
+	paint_pixels(window->shm_data, window->width, window->height, time);
 	wl_surface_attach(window->surface, window->buffer, 0, 0);
 	wl_surface_damage(window->surface,
 			  0, 0, window->width, window->height);
@@ -258,6 +299,8 @@ main(int argc, char **argv)
 
 	display = create_display();
 	window = create_window(display, 250, 250);
+	if (!window)
+		return 1;
 
 	sigint.sa_handler = signal_int;
 	sigemptyset(&sigint.sa_mask);
diff --git a/src/compositor.c b/src/compositor.c
index afa0848b..235b4a2b 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -2608,14 +2608,15 @@ load_module(const char *name, const char *entrypoint, void **handle)
 	module = dlopen(path, RTLD_LAZY);
 	if (!module) {
 		fprintf(stderr,
-			"failed to load module: %s\n", dlerror());
+			"failed to load module '%s': %s\n", path, dlerror());
 		return NULL;
 	}
 
 	init = dlsym(module, entrypoint);
 	if (!init) {
 		fprintf(stderr,
-			"failed to lookup init function: %s\n", dlerror());
+			"failed to lookup init function in '%s': %s\n",
+			path, dlerror());
 		return NULL;
 	}
 
@@ -2639,7 +2640,7 @@ int main(int argc, char *argv[])
 	char *shell = NULL;
 	char *module = NULL;
 	int32_t idle_time = 300;
-	int32_t xserver;
+	int32_t xserver = 0;
 	char *socket_name = NULL;
 	char *config_file;