make: depend on guile explicitly when available

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/make/make.mk

@@ -16,4 +16,11 @@ ifeq ($(BR2_STATIC_LIBS),y)
 	MAKE_CONF_OPTS += --disable-load
 endif
 
+ifeq ($(BR2_PACKAGE_GUILE),y)
+MAKE_DEPENDENCIES += guile
+MAKE_CONF_OPTS += --with-guile
+else
+MAKE_CONF_OPTS += --without-guile
+endif
+
 $(eval $(autotools-package))