diff --git a/Makefile.in b/Makefile.in
index 0d39b48..3d08539 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -16,7 +16,7 @@ all:	libsharegl.dummy
 	$(CC) $< -o $@ -c $(CFLAGS)
 
 libsharegl.dummy: sharegl.rc $(RUST_SRC)
-	$(RUSTC) $(RUSTFLAGS) $< -o $@
+	$(RUSTC) $(RUSTFLAGS) $< --lib --out-dir .
 	touch $@
 
 sharegl-test: sharegl.rc $(RUST_SRC)
diff --git a/platform/linux.rs b/platform/linux.rs
index 179ff84..25e9ca7 100644
--- a/platform/linux.rs
+++ b/platform/linux.rs
@@ -216,7 +216,7 @@ impl GraphicsContext {
             let pixmap = XCreatePixmap(display, root_window, 10, 10, 24);
             let glx_pixmap = glXCreateGLXPixmap(display, visual, pixmap);
 
-            debug!("XCreatePixmap returned %?, glXCreateGLXPixmap returned %?",
+            debug!("XCreatePixmap returned {}, glXCreateGLXPixmap returned {}",
                    pixmap,
                    glx_pixmap);