diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index 1b9a55d..05a769e 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -57,7 +57,9 @@ jobs:
           hash -r
           csc -version
 
-      # Eggs are pinned in eggs.lock and installed by the Makefile into .eggs/.
+      - name: Install dependencies
+        run: make deps
+
       - name: Build sexc
         run: make && ./sexc --help
 
diff --git a/Makefile b/Makefile
index 0d5eebf..8b15de0 100644
--- a/Makefile
+++ b/Makefile
@@ -34,24 +34,27 @@ DEPSLOCK = eggs.lock
 EGGS_DIR := $(abspath .eggs)
 
 # Compiler's own repository (types.db, chicken.*), ignoring ambient venv vars.
-SYSTEM_CHICKEN_REPO := $(shell env -u CHICKEN_INSTALL_REPOSITORY -u CHICKEN_REPOSITORY_PATH -u CHICKEN_EGG_CACHE -u CHICKEN_INSTALL_PREFIX $(CHICKEN_INSTALL) -repository 2>/dev/null)
+SYSTEM_CHICKEN_REPO := $(shell env \
+	-u CHICKEN_INSTALL_REPOSITORY -u CHICKEN_REPOSITORY_PATH \
+	-u CHICKEN_EGG_CACHE -u CHICKEN_INSTALL_PREFIX \
+	$(CHICKEN_INSTALL) -repository 2>/dev/null)
 CHICKEN_ABI := $(notdir $(SYSTEM_CHICKEN_REPO))
 EGGS_STAMP := $(EGGS_DIR)/.installed-$(CHICKEN_ABI)
 
-export CHICKEN_EGG_CACHE := $(EGGS_DIR)/cache
-export CHICKEN_INSTALL_REPOSITORY := $(EGGS_DIR)
-export CHICKEN_INSTALL_PREFIX := $(EGGS_DIR)
+# Try project-local chicken repository first. In case it doesn't exist (packaging for distros),
+# system-wide repository will be used.
+unexport CHICKEN_INSTALL_REPOSITORY
+unexport CHICKEN_EGG_CACHE
+unexport CHICKEN_INSTALL_PREFIX
 export CHICKEN_REPOSITORY_PATH := $(EGGS_DIR):$(SYSTEM_CHICKEN_REPO)
 
 all: sexc
 
-sexc: $(EGGS_STAMP) $(OBJ) main.scm
+sexc: $(OBJ) main.scm
 	$(CHICKEN_C) $(CSC_FLAGS) main.scm -o sexc-tmp -link sexc
         # otherwise csc hangs, probably because it tries to compile to sexc.o first
 	mv sexc-tmp sexc
 
-$(OBJ): $(EGGS_STAMP)
-
 #------------------------------------------------------------------
 
 utils.o: utils.module.scm utils.scm
@@ -82,11 +85,11 @@ sexc.o: sexc.module.scm types.o sexc.scm fmt-c-writer.o sex-macros.o sex-modules
 	$(CHICKEN_C) $(CSC_FLAGS) $(MODULE_FLAGS) sexc.module.scm -o sexc.o -unit sexc -link fmt-c-writer,sex-macros,sex-modules,reader,semen,types,utils
 
 # Unit testing
-sex-tests: $(EGGS_STAMP)
+sex-tests:
 	$(MAKE) -C ./tests sex-tests
 	cp ./tests/sex-tests ./
 
-sextest: $(EGGS_STAMP)
+sextest:
 	$(MAKE) -C ./tools/sextest sextest
 	cp ./tools/sextest/sextest .
 
@@ -116,9 +119,11 @@ installdirs:
 uninstall:
 	rm -f $(DESTDIR)$(bindir)/sexc
 
-# eggs.lock is the pin file (chicken-status -list). Install from it;
-# do not float versions on a normal build. Regenerating the lock:
-#   make deps-update
+$(EGGS_STAMP) deps-update: export CHICKEN_EGG_CACHE := $(EGGS_DIR)/cache
+$(EGGS_STAMP) deps-update: export CHICKEN_INSTALL_REPOSITORY := $(EGGS_DIR)
+$(EGGS_STAMP) deps-update: export CHICKEN_INSTALL_PREFIX := $(EGGS_DIR)
+$(EGGS_STAMP) deps-update: export CHICKEN_REPOSITORY_PATH := $(EGGS_DIR):$(SYSTEM_CHICKEN_REPO)
+
 $(EGGS_STAMP): $(DEPSLOCK)
 	mkdir -p $(CHICKEN_EGG_CACHE)
 	$(CHICKEN_INSTALL) -force -from-list $(DEPSLOCK)
@@ -126,10 +131,10 @@ $(EGGS_STAMP): $(DEPSLOCK)
 
 deps: $(EGGS_STAMP)
 
-deps-update: $(DEPSFILE)
-	rm -rf $(EGGS_DIR)
+deps-update: $(DEPSFILE) deps-clean
 	mkdir -p $(CHICKEN_EGG_CACHE)
 	$(CHICKEN_INSTALL) -force $$(cat $(DEPSFILE))
+	# Local repo only: a system path here would leak distro eggs into the lock.
 	CHICKEN_REPOSITORY_PATH=$(EGGS_DIR) $(CHICKEN_STATUS) -list | sort > $(DEPSLOCK).tmp
 	mv $(DEPSLOCK).tmp $(DEPSLOCK)
 	touch $(EGGS_STAMP)
diff --git a/Readme.org b/Readme.org
index e335085..11e4efa 100644
--- a/Readme.org
+++ b/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