diff --git a/tools/makesrc.inc b/tools/makesrc.inc
new file mode 100644
index 0000000000..1499dadc94
--- /dev/null
+++ b/tools/makesrc.inc
@@ -0,0 +1,14 @@
+# -*- Makefile -*-
+
+# return the list of sources to build in the SRC variable
+
+# This uses the native 'gcc' compiler and not $(CC) since we use the -include
+# option and older gcc compiler doesn't have that. We use one such older
+# compiler for the win32 cross-compiles on Linux.
+#
+# The weird grep -v thing in here is due to Apple's stupidities and is needed
+# to make this do right when used on Mac OS X.
+
+SRC := $(shell cat SOURCES | gcc -DMEMORYSIZE=$(MEMORYSIZE) $(INCLUDES) \
+$(TARGET) $(DEFINES) $(EXTRA_DEFINES) -E -P -include "config.h" - | \
+grep -v "^\#")