diff --git a/tools/tool-config.mk b/tools/tool-config.mk
index ce8ba5a..c59728e 100644
--- a/tools/tool-config.mk
+++ b/tools/tool-config.mk
@@ -1,8 +1,10 @@
-
 MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
 TOOLS_DIR := $(patsubst %/,%,$(dir $(MAKEFILE_PATH)))
 
+SOCKS_ARCH ?= x86_64
+
 include $(TOOLS_DIR)/make/gcc-host.mk
+SOURCE_ROOT := $(TOOLS_DIR)/..
 
 TOOLS_BUILD_DIR := $(TOOLS_DIR)/../build/tools
 BUILD_DIR := $(TOOLS_BUILD_DIR)/$(TOOL_NAME)