diff --git a/weld/config.mk b/weld/config.mk
new file mode 100644
index 0000000..c58aafb
--- /dev/null
+++ b/weld/config.mk
@@ -0,0 +1,31 @@
+# Copyright 2015 Andrew Gottemoller.
+#
+# This software is a copyrighted work licensed under the terms of the
+# Weld license.  Please consult the file "WELD_LICENSE" for
+# details.
+
+# Define default config options
+
+
+source_path     ?= .
+build_path      ?= ./build/out
+include_subdir  ?= include
+source_subdir   ?= source
+resource_subdir ?= resource
+arch            ?= amd64
+mode            ?= debug
+platform        ?= $(if $(WINDIR),win32,unix)
+shell_name      ?= $(if $(WINDIR),cmd,sh)
+c_toolchain     ?= gcc
+
+ifeq ($(platform),unix)
+    os := $(shell uname)
+    ifeq ($(os),Linux)
+        unix_flavor ?= linux
+    else ifeq ($(os),Darwin)
+        unix_flavor ?= darwin
+        gcc_opt_use_clang ?= 1
+    else ifeq ($(os),FreeBSD)
+        unix_flavor ?= bsd
+    endif
+endif