test: Generate dependency files

lib/test/Module.mk

@@ -10,13 +10,17 @@ LIB_TEST_SCANNER_OBJS := \
 	$(LIB_DIR)/error.ao \
 	$(LIB_DIR)/general.ao
 
+# Include all dependency files. We use '.rd' to indicate this will create
+# executables.
+INCLUDEFILES += $(LIB_TEST_SOURCES:.c=.rd)
+
 $(LIB_TEST_DIR)/test-scanner: $(LIB_TEST_SCANNER_OBJS)
 	$(CC) $(EXLDFLAGS) -o $@ $(LIB_TEST_SCANNER_OBJS) -Llib
 
 all-lib-test: $(LIB_TEST_TARGETS)
 user :: all-lib-test
 
-$(LIB_TEST_DIR)/test-scanner.ro: $(LIB_DIR)/data.h $(LIB_DIR)/conf.h $(LIB_DIR)/conf-parse.h $(LIB_DIR)/scanner.h
+$(LIB_TEST_DIR)/test-scanner.rd: $(LIB_DIR)/conf-parse.c
 
 clean-lib-test:
 	$(RM) $(LIB_TEST_DIR)/*.rd $(LIB_TEST_DIR)/*.ro