build: Disable printers panel is libsmbclient.pc isn't found

https://bugzilla.gnome.org/show_bug.cgi?id=693923

configure.ac

@@ -152,8 +152,7 @@ PKG_CHECK_MODULES(COLOR_PANEL, $COMMON_MODULES
                   colord-gtk >= $COLORD_GTK_REQUIRED_VERSION
                   gnome-desktop-3.0 >= $GNOME_DESKTOP_REQUIRED_VERSION)
 PKG_CHECK_MODULES(PRINTERS_PANEL, $COMMON_MODULES
-                  polkit-gobject-1 >= $POLKIT_REQUIRED_VERSION
-                  smbclient)
+                  polkit-gobject-1 >= $POLKIT_REQUIRED_VERSION)
 PKG_CHECK_MODULES(PRIVACY_PANEL, $COMMON_MODULES)
 PKG_CHECK_MODULES(REGION_PANEL, $COMMON_MODULES
                   polkit-gobject-1 >= $POLKIT_REQUIRED_VERSION
@@ -213,6 +212,14 @@ if test x${have_bluetooth} = xyes; then
   AC_DEFINE(HAVE_BLUETOOTH, 1, [Define to 1 if bluetooth support is available])
 fi
 
+# Check for smbclient
+PKG_CHECK_MODULES(SMBCLIENT, smbclient, [have_smbclient=yes], [have_smbclient=no])
+
+if test x"$have_smbclient" = x"no"; then
+    AC_MSG_WARN(*** Printer panel will not be built (smbclient.pc not found) ***)
+    enable_cups=no
+fi
+
 # Check for CUPS 1.4 or newer
 AC_ARG_ENABLE([cups],
               AS_HELP_STRING([--disable-cups], [disable CUPS support (default: enabled)]),,

panels/printers/Makefile.am

@@ -3,6 +3,7 @@ cappletname = printers
 INCLUDES = 						\
 	$(PANEL_CFLAGS)					\
 	$(PRINTERS_PANEL_CFLAGS)			\
+	$(SMBCLIENT_CFLAGS)				\
 	-I$(top_srcdir)/shell/				\
 	-DGNOMELOCALEDIR="\"$(datadir)/locale\""	\
 	$(NULL)
@@ -44,7 +45,7 @@ libprinters_la_SOURCES =		\
 	cc-printers-panel.c		\
 	cc-printers-panel.h
 
-libprinters_la_LIBADD = $(PRINTERS_PANEL_LIBS) $(PANEL_LIBS) $(CUPS_LIBS)
+libprinters_la_LIBADD = $(PRINTERS_PANEL_LIBS) $(PANEL_LIBS) $(CUPS_LIBS) $(SMBCLIENT_LIBS)
 
 resource_files = $(shell glib-compile-resources --sourcedir=$(srcdir) --generate-dependencies $(srcdir)/printers.gresource.xml)
 cc-printers-resources.c: printers.gresource.xml $(resource_files)