[gnome-shell] build: Fix when bluetooth is disabled

[Colin Walters <walters src gnome org>]

commit 618a53b34fb9d80cb0cb51d51b844fe19ffa2911
Author: Colin Walters <walters verbum org>
Date:   Thu Nov 3 21:27:50 2011 -0400

    build: Fix when bluetooth is disabled

 src/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 9cdfc89..375ff91 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -275,7 +275,7 @@ Shell_0_1_gir_CFLAGS = $(libgnome_shell_la_CPPFLAGS) -I $(srcdir)
 Shell_0_1_gir_LIBS = libgnome-shell.la
 Shell_0_1_gir_FILES = $(libgnome_shell_la_gir_sources)
 Shell_0_1_gir_SCANNERFLAGS = --include-uninstalled=$(builddir)/St-1.0.gir \
-	--add-include-path=$(MUTTER_GIR_DIR) -L $(BLUETOOTH_DIR)
+	--add-include-path=$(MUTTER_GIR_DIR) $(if $(BLUETOOTH_DIR),-L $(BLUETOOTH_DIR),)
 INTROSPECTION_GIRS += Shell-0.1.gir
 CLEANFILES += Shell-0.1.gir