diff --git a/config.example b/config.example
index 6ac2c721..4d303383 100644
--- a/config.example
+++ b/config.example
@@ -6,6 +6,12 @@
 # Change it to your name.
 MAINTAINER = $(shell whoami)
 
+# use your own target directory
+#TARGET_DIR = /path/to/your/root
+
+# use your own sources directory
+#SOURCE_DIR = /path/to/your/sources
+
 # -----------------------------------------------------------------------------
 
 # Choose one (1) of the following BOXMODELs. O n e !
diff --git a/make/environment-build.mk b/make/environment-build.mk
index 20b7cdbd..750c26ff 100644
--- a/make/environment-build.mk
+++ b/make/environment-build.mk
@@ -38,7 +38,7 @@ DEPS_DIR      = $(BASE_DIR)/deps
 D             = $(DEPS_DIR)
 HOST_DIR      = $(BASE_DIR)/host
 TARGET_DIR   ?= $(BASE_DIR)/root
-SOURCE_DIR    = $(BASE_DIR)/source
+SOURCE_DIR   ?= $(BASE_DIR)/source
 MAKE_DIR      = $(BASE_DIR)/make
 LOCAL_DIR     = $(BASE_DIR)/local
 STAGING_DIR   = $(BASE_DIR)/staging