dev: require make deps manually for dev & CI

Readme.org

@@ -12,22 +12,25 @@ Sex is statically typed, compiled general purpose language.
 First, get yourself a Chicken, then, some Chicken deps. You also will
 need a C compiler.
 
-Eggs are installed into a project-local ~.eggs/~ repository; they do not
-touch the Chicken system repository.
-
-** Compilation
+** Development
 #+begin_src sh
+  make deps
   make
 #+end_src
 
-That installs pinned eggs from ~eggs.lock~ into ~.eggs/~ if needed, then
-builds ~sexc~. ~dependencies.txt~ is the unpinned request list. To
-refresh ~eggs.lock~ after changing it:
+~make deps~ installs pinned eggs from ~eggs.lock~ into a project-local
+~.eggs/~ repository. ~dependencies.txt~ is the unpinned request list.
+To refresh ~eggs.lock~ after changing it:
 
 #+begin_src sh
   make deps-update
 #+end_src
 
+** Packaging for system package managers
+- Depend ~sex~ package on Chicken-6 (with ~libchicken.a~) and all eggs from ~dependencies.txt~.
+- Compile and install with ~make~ (usually no other arguments required).
+- Move resulting ~sexc~ binary to the appropriate place.
+
 ** Static compilation
 The default ~CSC_FLAGS~ include ~-static~, so ~sexc~ does not need
 ~.eggs~ at runtime and ~make install~ stays relocatable. Chicken must