diff -r 9131b58f51c4 -r abbbaffa9c9f devel-versioning.rst
--- a/devel-versioning.rst	Mon Nov 28 01:38:54 2011 +0200
+++ b/devel-versioning.rst	Mon Nov 28 01:48:19 2011 +0200
@@ -401,6 +401,39 @@
  * Reserving some possible names/prefixes for future use.
  * Generalising file format or protocol to envelop more cases.
 
+Extracting version from VCS.
+============================
+
+Including version in sources.
+=============================
+
+Don't use any ``$REVISION`` like keywords (usual practice in CVS, SVN)!
+
+Use sed, awk, M4 or any other preprocessor for non-compiled or non-preprocessed
+files (like .lisp, .py, .java files)::
+
+  $ cat my-version.el.in
+  (defvar my-major-version @VMAJOR@
+    "Major version.")
+  (defvar my-major-version @VMAJOR@
+    "Major version.")
+  (provide 'my-version)
+
+  $ cat Makefile
+  %: %.in
+      sed -e 's|@VMAJOR@|$(VMAJOR)|' -e 's|@VMINOR@|$(VMINOR)|' <$< >$@
+
+Pass version component to preprocessed file (like .c, .cxx files) through
+preprocessor::
+
+  $ cat my-version.c
+  int get_major_version() { return VMAJOR; }
+  int get_minor_version() { return VMINOR; }
+
+  $ cat Makefile
+  %.o: %.c
+      $(CC) -DVMAJOR=$(VMAJOR) -DVMINOR=$(VMINOR) -o $@ $<
+
 Reference.
 ==========